Astigmatism: Causes, Symptoms, and Treatment Options
What Is Astigmatism and What Causes It?
Understanding what astigmatism is and where it comes from helps you make informed decisions about your eye care. Most cases are present from birth, but the condition can also develop later in life due to injury, surgery, or certain eye diseases.
In a normally shaped eye, the cornea and lens are smooth and curved evenly in all directions, much like the surface of a basketball. This allows light to focus cleanly on the retina (the light-sensitive tissue at the back of your eye), producing a sharp image. With astigmatism, the cornea or lens curves more in one direction than the other, similar to the shape of a football, so light is spread across multiple focus points instead of one.
The result is that images at all distances can appear blurry, stretched, or doubled. Straight lines may look wavy, text may seem smeared, and both near and distant objects can look unclear at the same time. Astigmatism often occurs alongside nearsightedness or farsightedness, and your prescription will address all of these together.
Most astigmatism is inherited and present from birth, meaning it tends to run in families. If one or both of your parents have astigmatism, you have a higher chance of developing it as well. In some cases, the condition develops or worsens due to outside factors.
- Family history of astigmatism or other refractive errors
- Eye injuries or corneal scarring
- Certain eye conditions such as keratoconus (progressive corneal thinning) or pterygium (tissue growth on the eye surface)
- Previous eye surgery that alters corneal shape
- Chronic eye rubbing, which may contribute to gradual corneal changes over time
Regular astigmatism is the most common type. It occurs when the cornea curves more steeply in one direction than the other, creating two distinct focal lines. This type produces predictable blurring that can be corrected effectively with glasses, contact lenses, or laser surgery.
Irregular astigmatism happens when the corneal surface is uneven in multiple directions, often caused by injury, scarring, or conditions like keratoconus. Standard glasses often cannot fully correct irregular astigmatism, and specialized contact lenses or advanced treatments are frequently needed. Your eye care provider will determine which type you have during a comprehensive exam.
Signs and Symptoms of Astigmatism
Astigmatism can cause a range of symptoms that affect your daily life and comfort. Because many of these symptoms overlap with other vision conditions, a proper eye exam is the only reliable way to confirm the diagnosis.
The most telling sign of astigmatism is blurred or distorted vision that affects both near and far objects. Letters may look fuzzy, lines may appear wavy, and images can seem stretched in one direction. Unlike nearsightedness or farsightedness, which primarily affect one distance, astigmatism tends to cause visual confusion at every range.
Even mild astigmatism can make reading, using a computer, or recognizing faces more difficult than it should be, and these effects often worsen toward the end of a long day.
When your eyes struggle to produce a clear image, the muscles around them work overtime to compensate. This extra effort leads to tired, achy eyes, especially after extended reading or screen time. Many people with uncorrected astigmatism also experience frequent headaches, particularly across the forehead or behind the eyes.
- Squinting to try to sharpen your vision
- Headaches that appear after visual tasks like reading or computer work
- Sore or fatigued eyes by the end of the day
- Trouble concentrating on detail-heavy tasks
Astigmatism often becomes more noticeable in low-light conditions. You may see halos, starbursts, or streaks of light around streetlights and headlights, making nighttime driving uncomfortable or unsafe. This happens because your irregularly shaped cornea scatters incoming light in multiple directions rather than focusing it cleanly.
Reduced contrast sensitivity, or difficulty distinguishing objects against similar backgrounds in dim lighting, is another common effect. If you find yourself avoiding driving after dark because of poor vision, astigmatism may be a contributing factor.
Astigmatism itself does not require emergency care, but certain vision changes always need prompt, same-day attention. Contact us or go to an emergency room right away if you experience any of the following.
- A sudden increase in blurriness or double vision
- Sudden vision loss in one eye
- A curtain or shadow moving across your field of vision
- New flashes of light or a sudden increase in floaters
- Significant eye pain or redness accompanied by decreased vision
These symptoms can signal serious conditions such as retinal detachment, acute glaucoma, or corneal injury that require immediate treatment. Do not drive if your vision is suddenly impaired. Even gradual changes in vision between regular appointments are worth an earlier visit so we can monitor your eye health and update your prescription as needed.
How We Diagnose Astigmatism
Diagnosing astigmatism is a routine, painless part of a comprehensive eye exam. We use a combination of tests to measure how your eyes focus light and to map the precise shape of your cornea so we can recommend the most appropriate correction.
Your exam begins with a review of your symptoms, vision history, and general health. We then perform a series of tests to get a complete picture of how your eyes are functioning. The entire process is comfortable and typically takes less than an hour.
- Visual acuity testing to measure the sharpness of your vision at different distances
- Refraction assessment to identify your exact lens prescription
- Keratometry to measure the curvature of the front of your cornea
- A full health evaluation of your eye structures, including the retina and optic nerve
During a refraction test, you will look through an instrument called a phoropter, which holds a series of different lenses, while we ask you to compare which options make the eye chart appear clearest. Your responses allow us to pinpoint the exact prescription that will correct your astigmatism. This process is low-risk and gives us precise measurements of your refractive error.
We may also use an autorefractor, a device that shines a brief light into your eye and measures how it reflects back to provide an initial prescription estimate. This gives us a helpful starting point before the hands-on refraction test confirms the final numbers.
For a detailed view of your corneal shape, we use corneal topography or tomography. These imaging technologies create a color-coded map of the surface and internal structure of your cornea, revealing even subtle irregularities that standard testing might not capture.
This level of detail is especially important if you are considering laser vision correction or if we suspect irregular astigmatism or early keratoconus. The maps also allow us to track corneal changes over time, helping us tailor your treatment and monitor your eye health at every visit.
Non-Surgical Treatment Options for Astigmatism
Most people with astigmatism achieve clear, comfortable vision through glasses or contact lenses without ever needing surgery. We work with each patient to find the correction that fits their prescription, lifestyle, and preferences.
Glasses are the simplest and most widely used correction for astigmatism. Your prescription will include a cylindrical power (the amount of astigmatism correction needed) and an axis value (the orientation of the correction) so that the lenses are shaped precisely to compensate for your corneal curvature.
Depending on your prescription and daily activities, your eye care provider may recommend wearing glasses full time or only for specific tasks such as reading, computer work, or driving. Most people adjust to a new astigmatism correction within a few days to a week as the brain adapts to the improved image quality.
If you prefer contacts, toric soft lenses are designed specifically for astigmatism. They have different corrective powers in different meridians and include a stabilization system to keep them properly oriented on your eye. For higher prescriptions or irregular astigmatism, specialty options such as rigid gas permeable lenses, scleral lenses, or hybrid lenses often provide sharper vision.
- Soft toric lenses for mild to moderate astigmatism
- Rigid gas permeable lenses for higher or irregular astigmatism
- Scleral lenses that vault over the cornea for complex prescriptions or irregular corneal surfaces
- Hybrid lenses combining a rigid center with a soft outer skirt for a balance of clarity and comfort
- Daily disposable or monthly replacement schedules depending on your needs
Proper contact lens hygiene is essential no matter which type you wear. Always wash your hands before handling lenses, replace your lens case regularly, avoid exposing lenses to water, and never sleep in lenses unless your eye care provider has specifically prescribed extended wear.
Orthokeratology (also called Ortho-K) involves wearing specially designed rigid contact lenses overnight to gently reshape the cornea while you sleep. When you remove the lenses in the morning, the temporary reshaping allows you to see clearly throughout the day without glasses or standard contact lenses.
This non-surgical option is fully reversible and can be a good fit for children or adults who want clear daytime vision without committing to surgery. Because the reshaping effect is temporary, the lenses typically need to be worn most nights to maintain results. Ortho-K requires a custom fitting, strict cleaning habits, and regular follow-up appointments to make sure your corneal shape and eye health remain stable.
Surgical Treatment Options for Astigmatism
For patients who want to reduce their dependence on glasses or contacts, several surgical options are available. The right procedure depends on your prescription, corneal health, and overall eye anatomy, and our team will evaluate all of these factors carefully before making a recommendation.
LASIK is one of the most commonly performed refractive surgeries and can correct astigmatism along with nearsightedness or farsightedness. During the procedure, a thin flap is created in the outer cornea, a laser removes a precise amount of corneal tissue to reshape the surface, and the flap is gently repositioned. Many patients notice significantly improved vision within the first day or two after surgery.
Good LASIK candidates generally have stable vision, adequate corneal thickness, and realistic expectations about the outcome. Not all levels or types of astigmatism are suitable for LASIK, and irregular astigmatism in particular may not respond predictably. We use corneal topography and tomography to assess your candidacy and screen for risk factors such as corneal ectasia (progressive corneal thinning) and significant dry eye before recommending this procedure.
Photorefractive keratectomy (PRK) is a laser vision correction option that reshapes the cornea without creating a flap. Instead, the outer corneal layer is gently removed before the laser is applied, making PRK a suitable choice for patients with thinner corneas or certain lifestyle factors that increase the risk of flap-related complications with LASIK.
Other laser procedures include LASEK and SMILE (small incision lenticule extraction), which is often used for myopia with astigmatism. In select cases, topography-guided or wavefront-guided treatments can address specific corneal irregularities. Your eye care provider will explain the benefits, recovery expectations, and candidacy requirements for each option so you can make a fully informed choice.
If you have both astigmatism and cataracts (clouding of the natural lens inside the eye), we can address both conditions at once during cataract surgery by implanting a toric intraocular lens. These specially designed artificial lenses have built-in astigmatism correction and are positioned during surgery to align precisely with your corneal curvature, often reducing or eliminating the need for glasses after recovery.
In some cases, your surgeon may also perform astigmatic keratotomy or limbal relaxing incisions (small, precise cuts in the cornea) alongside cataract surgery to further reduce corneal astigmatism. The approach best suited to your prescription and eye anatomy will be discussed in detail during your surgical consultation.
Refractive surgery is not appropriate for everyone. There are several medical and lifestyle factors that may make surgery inadvisable, and being honest about these during your consultation helps us protect your long-term eye health.
- Unstable vision or prescriptions that are still changing
- Thin, irregular, or disease-affected corneas
- Active eye infections or significant inflammation
- Autoimmune conditions or other systemic diseases that affect healing
- Pregnancy or breastfeeding, which can temporarily affect corneal shape and healing
- Age under 18, as the eyes are typically still developing
If surgery is not recommended, glasses or specialty contact lenses remain excellent long-term options for clear and comfortable vision.
Living Well With Astigmatism
Astigmatism requires ongoing attention even after you receive your initial correction. Regular exams, good habits, and knowing what to expect at each stage of your care all contribute to lasting visual comfort.
It is normal to need a short adjustment period when you first start wearing glasses or new contact lenses for astigmatism, especially if your prescription has changed significantly. You might notice mild distortion at the edges of your lenses or brief moments of dizziness as your brain recalibrates to the clearer image. For most people, this settles within a few days.
If discomfort lasts longer than one to two weeks, or if things do not seem quite right, let us know. A small adjustment to your prescription or contact lens fit can make a meaningful difference in how well your correction works for you.
Astigmatism can gradually change over time, particularly during childhood, adolescence, and as you enter middle age. Regular comprehensive eye exams allow us to track any shifts in your prescription and update your correction before changes affect your daily vision.
Most adults benefit from a full eye exam every one to two years. Children, teenagers, and anyone with a history of progressive eye conditions may need more frequent visits. If you notice new blurriness, increased headaches, or eye fatigue between scheduled appointments, schedule a visit sooner rather than waiting.
Consistent daily habits support the effectiveness of your astigmatism correction and protect your overall eye health between appointments. Small routine choices add up over time and can help reduce strain and lower your risk of complications.
- Wear your prescribed glasses or contacts as directed by your eye care provider
- Follow proper contact lens hygiene, including regular case replacement
- Take regular breaks from screens using the 20-20-20 rule (every 20 minutes, look at something 20 feet away for 20 seconds)
- Wear sunglasses with UV protection when outdoors
- Avoid rubbing your eyes, as chronic rubbing can gradually alter corneal shape and increase the risk of conditions like keratoconus
- Eat a balanced diet that includes nutrients known to support eye health
Recovery timelines vary depending on which surgical procedure you have. After LASIK, most patients notice a significant improvement in vision within one to two days, though full stabilization can take several weeks. PRK involves a longer initial healing period, with noticeable improvement during the first week and continued refinement over the following months.
Temporary dry eye, glare, and halos around lights at night are common in the weeks following surgery. Less frequent but more serious risks include infection, inflammation, corneal ectasia, flap complications with LASIK, corneal haze with PRK, and the possibility of under-correction or over-correction that may require a follow-up enhancement procedure. Some patients may still need reading glasses as they age, regardless of the surgical outcome. We schedule follow-up visits to monitor your healing and address any concerns throughout your recovery.
Frequently Asked Questions
These answers address common questions we hear from patients who want guidance beyond the basics of astigmatism diagnosis and treatment.
Astigmatism is caused by the physical shape of your cornea or lens, so it does not resolve without treatment in the vast majority of cases. Very mild astigmatism in young children may shift slightly as their eyes mature, but meaningful improvement without correction is uncommon. Relying on the hope that it will resolve on its own can delay necessary treatment and, in children, may lead to amblyopia (lazy eye) if left uncorrected during key developmental years.
Astigmatism can remain stable for many years, but it may also change gradually, particularly in younger patients whose eyes are still developing or in adults who develop corneal thinning conditions. Certain factors, including chronic eye rubbing and progressive conditions like keratoconus, are associated with worsening astigmatism over time. Regular monitoring is the best way to catch changes early and adjust your correction before your vision is significantly affected.
Standard spherical soft contact lenses are not designed to correct astigmatism and generally will not provide clear vision if you have a meaningful amount of it. In some cases of very mild astigmatism, a spherical lens may be tolerated, but most patients need toric lenses or rigid gas permeable lenses for reliable clarity. Wearing the wrong lens type can lead to fluctuating vision, increased eye strain, and discomfort, so it is worth getting a contact lens fitting designed specifically for your prescription.
Laser vision correction reshapes the cornea permanently, but your eyes can continue to change after surgery due to natural aging or other factors. Some patients experience a gradual return of a mild prescription over the years, and others may develop the need for reading glasses as presbyopia (age-related difficulty focusing up close) develops. A small percentage of patients require an enhancement procedure to fine-tune their results. During your consultation, we will discuss what outcomes are realistic based on your specific prescription and eye health.
Nearsightedness (myopia) makes distant objects blurry, and farsightedness (hyperopia) makes nearby objects harder to see. Astigmatism causes distortion at all distances because the cornea or lens is unevenly curved, producing multiple focal points rather than one. It is also common to have a combination of astigmatism and either myopia or hyperopia, in which case your prescription addresses all components together. Understanding the difference helps set appropriate expectations for how correction will improve your vision.
Most vision insurance plans cover glasses and contact lenses for astigmatism correction, though the specific benefits, copays, and annual limits vary by plan. Refractive surgery such as LASIK or PRK is typically classified as an elective procedure and may not be covered, but some plans offer discounts or allow the use of flexible spending accounts or health savings accounts to offset the cost. We recommend contacting your insurance provider directly to confirm your benefits before your appointment.
Schedule Your Astigmatism Evaluation at ReFocus Eye Health
If blurry vision, frequent headaches, or difficulty seeing at night are affecting your quality of life, our team at ReFocus Eye Health is ready to help. We provide comprehensive eye exams and a full range of astigmatism treatment options for patients throughout Manchester and nearby communities, including East Hartford, South Windsor, and Vernon. Our experienced providers will take the time to understand your vision goals and guide you toward the correction that fits your life. Contact us today to schedule your appointment and take the first step toward clearer, more comfortable vision.
I felt so seen and cared for by ReFocus in Manchester, CT. They saw me quickly, explained everything well, and helped me figure out next steps to care right away. And they were so kind and compassionate too!
Christianne Smith
Friendly efficient professional staff The place to go for World class eye care Dr Goldstein is the tops!!!!
Robert Valli
Very helpful and made sure I had the professional help and support needed even after hours. Thank you again to the team at ReFocus Eye Health
Eric Campbell
I was pleased to meet Dr. Goldstein yesterday. My eyes were checked thoroughly; and much to my relief there is help for my dry eye problem.
LIGITA Giacopassi
I was very happy with my first appointment with Dr O. He was very efficient, on time and explained everything to me jn detail. He was very professional. I will be happy to recommend him to others.
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