Why Astigmatism Blurs and Stretches Vision at Every Distance and How Care Is Planned

The letters on the chart are not exactly fuzzy. They are leaning. The vertical strokes of the H look sharp enough, but the crossbar smears, and the O has quietly become an egg. When the examiner slides a new lens into place and asks, “Better or worse?”, the room seems to snap into focus in one direction and stay soft in the other. That odd, directional blur is the first clue to how astigmatism affects vision, and it puzzles people because it does not behave like ordinary nearsightedness.

Most people have a small amount of it. Many never notice. For others, it shows up as evening headaches, headlights that sprout streaks, or a phone screen that is never quite crisp no matter how close or far it is held.

This explainer walks through what is happening inside the eye, how the error is measured, and how an eye care team decides between doing nothing, glasses, contact lenses or a surgical option.

How astigmatism affects vision: the football-shaped cornea explained

Picture the front of a healthy eye as the side of a basketball: curved the same amount in every direction. Light passing through that dome bends evenly and lands on the retina, the light-sensing layer at the back of the eye, as a single tidy point. Now picture the side of an American football. It curves steeply one way and gently the other. Light entering a surface like that bends more along the steep meridian than the flat one, so it never gathers into a single point. Two focal lines form instead, one in front of the other.

That is astigmatism. The word simply means “without a point,” and it describes a refractive error, an imperfection in how the eye bends light, rather than a disease. The cornea, the clear front window of the eye, is the usual culprit, because it does roughly two thirds of the eye’s focusing. Less often the crystalline lens sitting behind the pupil is the uneven part, which is called lenticular astigmatism.

The mismatch between the two meridians is measured in diopters, the unit opticians use for lens strength. A small mismatch spreads each point of light into a tiny line the brain barely notices. A larger one turns every point in the scene into a smear, and because every point is smeared in the same direction, straight edges look thickened or doubled along one orientation.

Astigmatism is common. The National Eye Institute puts it at roughly one person in three, and it frequently travels alongside nearsightedness or farsightedness rather than appearing alone.

Why the blur shows up at every distance, not just far or near

Nearsighted people know exactly where their vision fails: far away. Farsighted people struggle up close. Astigmatism refuses to pick a side, and the reason is those two focal lines.

An eye focuses by changing the shape of its lens, a process called accommodation. It can pull the whole image forward or push it backward, but it cannot move the two meridians independently. If the eye adjusts so the steep meridian is sharp, the flat one is still out of focus, and vice versa. Most eyes settle for a compromise position between the two lines, a spot opticians call the circle of least confusion. Nothing is perfectly crisp there, but nothing is dreadful either.

The consequence is that moving closer to a book or stepping back from a sign does not fix the problem. The stretching follows the person at every distance. Readers often describe letters looking taller than they should, or the tails of a y and a g bleeding into the line below. Vertical blinds, tile grout and text on a screen are common places to notice it because the eye is comparing many parallel lines at once.

Effort adds a second layer. The eye keeps hunting for a focus it can never fully reach, and that constant refocusing is one reason the NHS lists headaches and eye strain among the things people report, especially after long reading or screen sessions. Squinting helps briefly by narrowing the pupil and trimming the blur, which is why a person with uncorrected astigmatism may be caught squinting at both the television and the menu.

Astigmatism vs nearsightedness: what is actually different

People often lump these together as “needing glasses,” and the two frequently coexist, but they come from different geometry.

Nearsightedness, or myopia, usually means the eyeball is slightly too long from front to back, or the cornea is too steep overall. Light from distant objects focuses in front of the retina. Close objects, which need less bending, land correctly. The blur is uniform: a distant circle still looks like a circle, just a soft one. Farsightedness, or hyperopia, is the reverse; the eye is a little short and near work is the struggle.

Astigmatism is not about length. It is about symmetry. The eye may be exactly the right length yet still see poorly because the front surface is not the same curve in every direction. A circle does not just go soft, it goes oval, and the direction of the stretch is fixed by the orientation of the steep meridian.

The correction reflects that difference. A lens for myopia has the same power all the way around, like a saucer. A lens for astigmatism, called a cylindrical lens, has power in one direction only, like a slice from the side of a tube. Mayo Clinic notes that most prescriptions combine both, correcting the overall focus with a spherical component and the directional error with a cylindrical one set at a specific angle.

This is also why an astigmatism prescription includes an axis, a number between 1 and 180 that tells the lab which way to orient the cylinder. Nearsightedness alone has no axis because there is no direction to correct.

What causes astigmatism, and can astigmatism get worse over time?

For most people, the shape was there from the start. Corneal curvature is largely inherited, and the NHS and National Eye Institute both describe astigmatism as something most people are born with. It can also arrive later. An eye injury, a corneal scar, some types of eye surgery and prolonged pressure from a drooping eyelid or an eyelid growth can all change the front curve. Cataracts, which cloud and sometimes reshape the natural lens, can add a lenticular component in later life.

Whether it worsens depends on the type. Regular astigmatism, where the two meridians sit at right angles to each other, tends to shift slowly and modestly across a lifetime. Children can see the amount and even the direction change as the eye grows. Adults often notice small drifts in the axis or cylinder on successive prescriptions rather than a dramatic slide. Cleveland Clinic describes the condition as one that can change gradually with age but that does not typically become severe on its own.

Irregular astigmatism is different. Here the meridians are not neatly perpendicular, or the curvature is uneven across the surface, usually because of scarring or a thinning disorder called keratoconus, in which the cornea steepens and bulges into a cone. That form can progress, especially in the teens and twenties, and it is the situation where a clinician will want to track corneal shape closely.

What does not cause it: reading in dim light, sitting close to a screen, or wearing the “wrong” glasses. These are enduring myths that Mayo Clinic explicitly rejects.

Astigmatism symptoms at night: halos, streaks and headlight starbursts

Ask someone with moderate astigmatism when they notice it most and the answer is often a dark road. Oncoming headlights grow long vertical tails. Streetlamps bloom into stars. The lane markings feel slightly doubled. Daytime, the same eyes may seem almost fine.

Two things happen after sunset. First, the pupil widens to let in more light, and a bigger pupil uses more of the cornea, including the outer zones where the shape is least regular. Blur that a small daytime pupil trimmed away now gets through. Second, the scene itself changes: bright points against a black background make a smeared focus obvious in a way that a sunlit, evenly lit room never does. A stretched point of light is far more visible than a stretched patch of wall.

The direction of the streak follows the axis. Someone whose steep meridian runs up and down will see headlights smear vertically; someone with an oblique axis sees them lean. This is why two people in the same car can describe the same headlight so differently.

Night glare is a recognized feature of uncorrected astigmatism, and the NHS lists difficulty seeing at night among the things people report. Glare is not exclusive to it, though. Early cataract, dry eye and some medications can produce halos too, and the pattern after refractive surgery can be different again. A new or rapidly worsening glare problem is a reason to have the eyes examined rather than to assume the prescription has simply drifted, because the examiner can tell those causes apart with a slit lamp and a refraction in a few minutes.

How an eye exam measures astigmatism, and how to read the prescription

Diagnosis rests on a routine exam, not a specialist test. The examiner starts with visual acuity, the letter chart, then moves to refraction, the “better or worse” sequence in which lenses are swapped in front of each eye. Cylindrical lenses are rotated as well as changed in power, and the point where the letters stop stretching tells the examiner the axis. An autorefractor, a machine that shines light into the eye and reads its reflection, often produces a starting estimate. A keratometer or corneal topographer maps the curvature of the cornea directly and is the tool that separates regular from irregular shapes.

Children and people who cannot report reliably are often examined with retinoscopy, in which the clinician watches how a light reflex moves across the pupil. Dilating drops may be used to relax the focusing muscle so that the true error shows; MedlinePlus notes the resulting light sensitivity and near blur wear off over a period of hours.

The prescription that results has three parts per eye. Sphere is the overall focusing power, negative for nearsightedness and positive for farsightedness. Cylinder is the amount of astigmatism, in diopters. Axis is the orientation of the cylinder, written in degrees from 1 to 180, where 90 is vertical and 180 is horizontal. A line reading “−2.00 −1.25 x 180” therefore means moderate nearsightedness with a moderate amount of astigmatism corrected along the horizontal meridian.

Small cylinder values are extremely common and often left uncorrected if the person is comfortable. Whether a given amount is worth correcting is a judgement the examiner makes with the person in the chair, weighing symptoms and how much the extra lens actually improves the chart.

Who usually needs correction, and who is usually asked to wait

Astigmatism is not a condition that always demands treatment, and the decision splits into two very different questions: does this person need optical correction at all, and, if they are considering surgery, is now the right time.

Correction is generally offered when the error is large enough to reduce clarity or cause strain. Someone with a small, symptom-free amount who reads the bottom lines of the chart comfortably may reasonably be told to do nothing and recheck at the next routine exam. Someone with headaches after screen work, or trouble with night driving, is usually helped by glasses or contact lenses regardless of the raw number. Cleveland Clinic frames the threshold in terms of impact on daily life rather than a fixed cutoff.

Children sit in a separate category. Uncorrected astigmatism in a young child can interfere with how the visual pathway develops, so the bar for correcting is lower and the follow-up closer, a point returned to below.

Surgery is where the waiting list, so to speak, is longest. Mayo Clinic’s guidance on laser vision correction describes several situations in which candidates are usually asked to hold off or are advised against it: a prescription that has changed within the past year, because the target is still moving; pregnancy or breastfeeding, which can temporarily alter refraction; significant dry eye; corneas that are thin or irregular, including keratoconus; and uncontrolled conditions such as diabetes or autoimmune disease that affect healing. Age matters too, since most surgeons want the refraction to have settled after the growth years.

In each case the recommendation comes from the examining team after measuring the individual eye. There is no self-qualifying checklist that substitutes for that visit.

How glasses correct astigmatism and what the first two weeks feel like

A glasses lens for astigmatism does something quietly elegant. It adds focusing power along one meridian only, exactly enough to pull the flat meridian of the eye into line with the steep one. The two focal lines collapse into a single point on the retina, and the egg becomes a circle again. Because the lens has an axis, the frame has to sit where the examiner expects; a pair that slides down the nose or tilts on one side rotates the cylinder away from the eye’s own axis and reintroduces blur. This is why the optician fusses over fit more with an astigmatic prescription than with a simple one.

The first days in a new or changed cylinder are famously strange. Floors can appear to slope. Door frames may seem to lean. Walking down stairs can feel slightly untrustworthy. None of this means the prescription is wrong. The brain has been compensating for stretched images for years, and it needs time to relearn what straight looks like. Cleveland Clinic describes an adjustment period of days to a couple of weeks, and most people find the tilting sensation fades fastest if they wear the glasses consistently rather than switching back and forth with an old pair.

Persistent distortion beyond that window, headaches that get worse rather than better, or a feeling that one eye is fighting the other are reasons to go back. Sometimes the axis was transcribed wrongly or the frame was fitted a few degrees off; sometimes the examiner will deliberately prescribe a partial correction first and step up later. Either way, the fix is a conversation with the optician, not persistence through discomfort.

Toric contact lenses for astigmatism and other lens options

A round soft contact lens cannot correct astigmatism because it has the same power in every direction and it rotates freely on the eye. Toric lenses solve both problems. They carry different powers in different meridians, and they are weighted or thinned at the bottom so that gravity and the blink settle them into the same orientation each time. Fitting takes a little longer than for a standard lens, because the examiner watches how the lens sits and may adjust the axis to compensate for any predictable rotation.

Rigid gas permeable lenses take a different route. Because they hold their shape, the tear film fills in the gap between the lens and the uneven cornea and creates a new, smooth front surface. They correct even irregular astigmatism that glasses cannot, which is why they and their larger cousins, scleral lenses that vault over the whole cornea and rest on the white of the eye, are mainstays for keratoconus. Hybrid designs with a rigid center and a soft skirt exist as well.

Option	How it corrects the error	Usually considered for	Points the care team weighs
Glasses with a cylindrical lens	Adds power along one meridian	Most regular astigmatism, all ages	Frame fit and axis alignment
Soft toric contact lenses	Meridian-specific power, stabilized against rotation	Regular astigmatism, contact lens wearers	Rotation stability, dryness, hygiene
Rigid gas permeable or scleral lenses	Tear layer creates a new smooth surface	Higher or irregular astigmatism, keratoconus	Comfort adaptation, specialist fitting
Laser reshaping (LASIK, PRK, SMILE)	Removes tissue to even out the cornea	Adults with stable prescriptions and healthy corneas	Corneal thickness, dry eye, expectations
Toric intraocular lens at cataract surgery	Replacement lens carries the cylinder	Adults having cataract surgery who also have astigmatism	Accurate alignment during surgery

Every row is a starting point for discussion, not a ranking. Which one suits an individual depends on the shape of their cornea, their eye surface health and what they need their vision for.

Laser and surgical options: what actually happens and who is a candidate

Refractive surgery treats astigmatism the way a lens does, by evening out the difference between meridians, but it does so by reshaping the cornea itself. In LASIK, a thin flap is lifted from the corneal surface, an excimer laser removes a precisely calculated pattern of tissue beneath it, and the flap is laid back down. PRK removes the surface layer instead of making a flap and lets it regrow. SMILE uses a femtosecond laser to cut a small lens-shaped piece of tissue inside the cornea and draws it out through a tiny incision. In all three, the laser takes more tissue from the steep meridian to flatten it toward the flat one.

Timelines vary by person, and Mayo Clinic describes the general pattern: vision is typically hazy in the first day, improves over the following days, and the cornea continues to settle for about two to three months, during which the final result is not yet known. Dry eye is common in that window and sometimes persists. Glare and halos at night can be worse than before while healing proceeds. Undercorrection, overcorrection and later drift are recognized possibilities, and a small proportion of people are offered an enhancement procedure. Flap complications and infection are uncommon but serious.

People who are having cataract surgery anyway have a different option. The clouded natural lens is removed and replaced with an artificial one, and a toric version of that implant can carry the cylinder correction. Its alignment inside the eye has to be precise, which is why the surgeon marks the axis beforehand.

Candidacy is decided by measurement: corneal thickness, topography, tear film, pupil size and prescription stability. The surgeon and the referring optometrist make that call together with the person, and a recommendation to wait or to choose lenses instead is a legitimate outcome of the assessment, not a failure of it.

Astigmatism in children: why early detection matters more than in adults

A child with uncorrected astigmatism rarely complains. They have never seen the world any other way, so a stretched letter is simply what a letter looks like. That silence is exactly why pediatric eye screening exists.

The concern is a condition called amblyopia, sometimes called lazy eye, in which the brain learns to rely on the clearer eye and gradually stops developing the connections from the blurrier one. If one eye has significantly more astigmatism than the other, or both have a large amount, the visual pathway can fail to sharpen during the years when it is most adaptable. The National Eye Institute and MedlinePlus both describe correcting refractive error early as a core part of preventing and treating amblyopia, because the pathway becomes much harder to influence later in childhood.

Detection usually comes from routine vision screening at well-child visits or in school, or from a parent noticing the child squinting, tilting the head or sitting unusually close to things. Any of these prompts a full exam, often with dilating drops so the child cannot mask the error by focusing hard.

Treatment is almost always glasses, and the frame fitting is as important as the lens. Children’s astigmatism can change as the eye grows, so rechecks are scheduled more frequently than for adults; the interval is set by the examining clinician rather than a fixed rule. When amblyopia is already present, the team may add patching of the stronger eye or other strategies to encourage the weaker one to work.

Contact lenses and surgery are generally not first choices in young children, and any such decision belongs with a pediatric eye specialist who has examined the child.

Irregular astigmatism and keratoconus: when the cornea itself needs attention

Most of this article concerns regular astigmatism, the tidy football shape that glasses fix neatly. A smaller group of people have a cornea that is uneven in a way no single cylinder can correct, and for them the conversation shifts from the prescription to the cornea itself.

Keratoconus is the best-known cause. The corneal tissue thins and gradually bulges forward into a cone, usually beginning in the teens or early adulthood. Early on it looks like ordinary astigmatism that keeps changing; later, glasses stop delivering sharp vision because the surface is too irregular to correct with a lens that sits in a frame. Johns Hopkins describes frequent prescription changes and growing sensitivity to glare as common ways it announces itself. Vigorous eye rubbing is associated with progression, and people with allergic eye disease are often advised about it.

Corneal scarring after infection or injury, and surface changes after some eye operations, can produce irregular astigmatism too. The diagnostic tool in every case is corneal topography, which maps the curvature point by point and reveals patterns the refraction alone cannot.

Management follows the shape. Rigid gas permeable or scleral lenses restore a smooth optical surface and are the mainstay for vision. For progressive keratoconus, a procedure called corneal cross-linking, which uses riboflavin drops and ultraviolet light to stiffen the corneal tissue, is used with the aim of slowing further steepening; it is not designed to sharpen vision on its own, and eligibility depends on corneal thickness and documented progression. Advanced cases with scarring may eventually be considered for corneal transplant. Each of these steps is a specialist decision, taken after serial measurements rather than a single visit.

What people often get wrong about astigmatism

Few eye conditions attract as much confident misinformation as this one, partly because the word sounds ominous and partly because almost everyone has a relative with an opinion.

“Screens caused it.” They did not. Corneal shape is largely set by genetics and growth, and neither reading in the dark nor phone use changes the curvature of the eye. Mayo Clinic lists this among the myths it explicitly dismisses. Screens can cause tired eyes and expose an existing error, which is a different thing.

“It is a disease.” It is a refractive error, the same category as nearsightedness. Irregular forms linked to keratoconus or scarring do involve the cornea’s health, but ordinary astigmatism is a shape, not an illness.

“Everyone with it needs glasses.” Small amounts are extremely common and frequently left uncorrected when the person sees comfortably. The number on the prescription matters less than whether it is causing blur or strain.

“Contact lenses cannot correct it.” Toric soft lenses and rigid lenses do exactly that; the belief dates from an era before stabilized soft designs were widely available.

“It always gets worse.” Regular astigmatism tends to shift slowly and modestly. Progressive worsening is the pattern of keratoconus, which is a separate and far less common situation.

“Surgery makes it permanent.” Laser surgery reshapes the cornea as it is at the time. The eye continues to age, the natural lens changes, and some drift over the years is possible. Surgeons discuss this honestly, and the phrase to be wary of is any promise that a result is guaranteed for life.

“Astigmatism leads to blindness.” There is no evidence for this. Uncorrected astigmatism in childhood can affect visual development, which is why screening matters, but the error itself does not damage the retina or the optic nerve.

Questions to ask your care team about astigmatism

The examination chair is a poor place to think of questions; the letters are gone, the drops are stinging and the next appointment is waiting. Bringing a short list changes the visit. These are the ones that tend to unlock the most useful answers.

• How much astigmatism do I have, and is it regular or irregular in shape?
• Is it mainly in the cornea or the lens, and does that change what you recommend?
• Do I need correction at all right now, or is this an amount you would watch?
• Has the axis or cylinder changed since my last exam, and what does that pattern suggest?
• If I want contact lenses, would a toric soft lens or a rigid lens suit my eyes better, and why?
• What should my new glasses feel like in the first two weeks, and when should I come back if they still feel wrong?
• Am I a reasonable candidate for laser or lens-based surgery, and if not, what specifically rules it out or suggests waiting?
• What are the realistic risks for someone with my corneal thickness and tear film?
• How will my night driving change with correction, and is any of my glare coming from something other than astigmatism?
• For a child: how often should we recheck, and what signs at home should prompt an earlier visit?

Write the answers down or ask for them in the after-visit summary. Astigmatism is measured in numbers, and having the sphere, cylinder and axis from previous years in one place lets any future examiner see the trend at a glance. That trend, more than any single reading, is what shapes the plan.

When to call your doctor

Astigmatism itself is stable and painless, which is exactly why a sudden change in vision should never be attributed to it. The red flags below are not about the shape of the cornea; they are about conditions that can masquerade as a prescription problem while needing prompt care.

Seek same-day or emergency eye care for a sudden loss or sharp drop in vision in one or both eyes; a shower of new floaters, flashes of light, or a shadow or curtain moving across the field of view, which MedlinePlus describes as possible signs of retinal detachment; eye pain, especially with nausea, redness and halos around lights, which can signal a rapid rise in eye pressure; or double vision that persists when one eye is covered, or that appears suddenly alongside weakness, slurred speech or a severe headache.

Contact lens wearers should stop wearing the lens and call the same day for a red, painful, light-sensitive eye or any white spot on the cornea, since corneal infection can progress quickly.

After any refractive or cataract surgery, follow the written instructions from the surgical team and call promptly for worsening rather than improving vision, increasing pain, discharge, or a sense that something has shifted in the eye.

Less urgently, book an appointment if glasses that once worked no longer do, if glare or night driving has worsened over weeks, if a child is squinting, tilting the head or holding things unusually close, or if your prescription seems to be changing at every visit. That last pattern is one of the ways keratoconus first shows itself, and it deserves a corneal map rather than another pair of glasses. In every case, the examining team decides what the finding means and what happens next.

Frequently asked questions

How does astigmatism affect vision differently from nearsightedness?

Astigmatism stretches or smears images in one direction at every distance, while nearsightedness blurs distant objects evenly and leaves near vision clear. The difference comes from geometry: nearsightedness reflects an eye that is slightly too long, whereas astigmatism reflects a cornea or lens curved more steeply in one meridian than another. Many people have both, which is why most prescriptions contain a spherical and a cylindrical component.

Can astigmatism get worse as you get older?

Regular astigmatism usually changes slowly and modestly across adulthood rather than worsening dramatically. Small shifts in cylinder or axis between exams are common, and changes in the natural lens later in life, including cataract, can add a lenticular component. Rapid or repeated worsening, especially in teenagers and young adults, is the pattern seen in keratoconus and should prompt corneal mapping rather than simply a stronger prescription.

Why are astigmatism symptoms at night so much worse?

In dim light the pupil widens, letting light through the outer parts of the cornea where curvature is least regular, so blur that a small daytime pupil trimmed away now reaches the retina. Bright points against darkness, such as headlights, also reveal a stretched focus far more clearly than a lit room does. Streaks follow the direction of the eye’s axis. New or rapidly worsening glare deserves an exam, since cataract and dry eye cause halos too.

Do toric contact lenses for astigmatism really work?

Yes, toric soft lenses are designed specifically for regular astigmatism. They carry different powers in different meridians and are weighted or thinned so the blink settles them into the same orientation, which a standard round lens cannot do. Fitting takes slightly longer because the examiner checks for rotation. Rigid gas permeable or scleral lenses are used when the cornea is irregular, because the tear layer beneath them creates a new smooth optical surface.

Does everyone with astigmatism need glasses?

No. Small amounts of astigmatism are extremely common and are often left uncorrected when the person reads the chart comfortably and has no strain or glare. Correction is offered when the error reduces clarity or causes symptoms such as headaches, tired eyes after screen work or difficulty driving at night. Children are the exception, because uncorrected astigmatism can interfere with visual development, so the threshold for correcting them is lower.

What do the numbers on an astigmatism prescription mean?

Each eye has three values. Sphere is the overall focusing power, negative for nearsightedness and positive for farsightedness. Cylinder is the amount of astigmatism in diopters, the unit of lens strength. Axis is the direction of the correction in degrees from 1 to 180, where 90 is vertical and 180 horizontal. A frame that slides or tilts rotates the cylinder away from that axis and brings blur back.

Why do my new astigmatism glasses make the floor look tilted?

Because your brain spent years compensating for stretched images and is now relearning what straight looks like. Cleveland Clinic describes an adjustment period of days to a couple of weeks, during which floors can seem to slope and door frames to lean. Wearing the glasses consistently shortens it. If distortion or headaches persist beyond that window, return to the optician, since the axis may be off or the frame fitted slightly wrong.

Can laser surgery fix astigmatism permanently?

Laser procedures such as LASIK, PRK and SMILE reshape the cornea to even out the difference between its meridians, and for many adults with stable prescriptions the effect is long-lasting. It is not guaranteed for life; the eye continues to age and some drift is possible. Mayo Clinic describes the cornea settling over about two to three months, with dry eye and night glare common during healing. Candidacy is decided by the surgical team after measurement.

Is astigmatism caused by screens or reading in the dark?

No. Corneal shape is largely inherited and set during growth, and Mayo Clinic lists reading in dim light and sitting close to screens among the myths it rejects. Screens can tire the eyes and make an existing error more noticeable, which is a different thing. Astigmatism acquired later in life usually follows injury, scarring, eyelid pressure, certain eye surgeries or, in keratoconus, thinning of the cornea itself.

How is astigmatism found in a child who does not complain?

Usually through routine vision screening at well-child visits or school, or when a parent notices squinting, head tilting or sitting very close to objects. A full exam often uses dilating drops so the child cannot mask the error by focusing hard, and the clinician may use retinoscopy, watching a light reflex move across the pupil. Early correction matters because uncorrected astigmatism can contribute to amblyopia, where the brain under-develops vision in the blurrier eye.

References

• National Eye Institute (NIH): Astigmatism
• NHS: Astigmatism
• Cleveland Clinic: Astigmatism
• MedlinePlus: Astigmatism

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.