Yes, you can have both conditions in the same eye. Myopia (nearsightedness) blurs distant objects because the eye is too long or the cornea curves too steeply. Astigmatism blurs or distorts vision at all distances because the cornea is irregularly shaped, like a football rather than a sphere. When both occur together, it is called myopic astigmatism, one of the most common refractive error combinations. A single pair of glasses or toric contact lenses can correct both at once.
Myopic Astigmatism: What a Combined Prescription Means for Dispensing
Myopia and astigmatism turn up together often: the same anatomical factors that elongate the eye (myopia) frequently also reshape corneal curvature (astigmatism). There are two forms:
- Simple myopic astigmatism: one focal point lands on the retina, the other lands in front of it
- Compound myopic astigmatism: both focal points land in front of the retina, the more common form of the two
What a Combined Prescription Looks Like
A prescription for someone with myopia and astigmatism in both eyes might read:
| OD (Right) | OS (Left) | |
|---|---|---|
| SPH | -3.25 | -4.00 |
| CYL | -1.50 | -0.75 |
| Axis | 170 | 015 |
The negative sphere corrects the myopia; cylinder and axis correct the astigmatism. A single lens handles both, but what those cylinder and axis numbers do matters for the fitting decisions below.
Lens Design and Thickness at Higher Cylinder
Cylinder power adds thickness unevenly across the lens, unlike sphere power, which adds it more uniformly: a -4.00 SPH / -1.50 CYL lens edges out visibly thicker in a wide or angular frame than a -4.00 SPH lens alone. Smaller, rounder frames minimize the difference. A lens thickness calculator estimates the expected edge thickness from the prescription and frame before ordering; see how prescription affects lens thickness for the physics and material tradeoffs.
Why Axis Accuracy Matters More as Cylinder Rises
Cylinder correction only works when the lens sits at its prescribed axis. A few degrees of rotation, or a lens decentered from the pupil, introduces unwanted prism under Prentice’s Rule (induced prism equals lens power multiplied by decentration). At low cylinder that error is barely noticeable; at high cylinder it produces the same “something feels wrong” complaints patients often blame on the prescription rather than the fit. That is why PD measurement methods and pupil-to-lens alignment deserve more attention as cylinder rises, and why practices selling glasses online rely on remote PD measurement to get that alignment right without an in-person exam.
Getting Used to a New Cylinder Correction
A common scenario in optical practice: a patient returns two weeks after collecting new glasses complaining the prescription “feels wrong” and walls appear to lean. The sphere hasn’t changed, but the axis shifted 15 degrees from the previous prescription, and the lenses check out correctly on the lensometer. The issue is adaptation, the brain recalibrating to the new cylinder orientation, not a fitting error; comparing the new prescription to the old one and confirming optical center alignment usually settles it in under five minutes.
What Is Myopia (Nearsightedness)
Myopia is a refractive error where the eyeball is longer than average or the cornea is too curved, so light converges in front of the retina instead of on it. Nearby objects stay sharp; anything at a distance looks blurry.
The American Academy of Ophthalmology classifies myopia by severity: mild (up to -3.00 diopters), moderate (-3.00 to -6.00 D), and high (greater than -6.00 D).
A landmark meta-analysis of 145 studies by Holden et al., published in Ophthalmology, projected that by 2050, 4,758 million people (49.8% of the world’s population) will have myopia, with 938 million having high myopia, more than double the 2000 prevalence of 1,406 million (22.9%). (Holden et al., 2016) The study was conducted with the Brien Holden Vision Institute following a joint WHO-BHVI global scientific meeting on myopia.
In the United States, the National Eye Institute estimates that about 41.6% of Americans are currently nearsighted, up from 25% in the early 1970s.
Symptoms and Risk Factors
Patients typically notice myopia during school-age years: difficulty reading the board, squinting at road signs, or trouble recognizing faces across a room, while near vision stays clear.
- Blurry vision for distant objects, squinting, headaches after distance-vision tasks, and end-of-day eye strain
- Genetics: one myopic parent roughly doubles the risk; two myopic parents raises it further
- Time outdoors: children who spend less time outdoors develop myopia at higher rates
- Sustained near work: extended reading or screen time without breaks speeds progression in children
- Age of onset: earlier childhood onset tends to reach higher final prescriptions
What Is Astigmatism
Astigmatism occurs when the cornea, or less often the lens, has an irregular curvature: steeply curved in one meridian, flatter in another, like a football rather than a sphere. Light can’t converge at a single focal point on the retina; two focal lines form instead, producing blurred or distorted vision at all distances.
Astigmatism is among the most common refractive errors, per the American Optometric Association, and can exist alongside myopia or hyperopia in the same eye. A 2023 systematic literature review in Optometry and Vision Science reported that astigmatism affects between 8% and 62% of the general population depending on the diagnostic threshold used, with an aggregate estimate close to 40% of adults globally when clinically relevant levels are considered. (Zhang et al., 2023, PMC10045990)
It is also categorized as corneal (most common) or lenticular, and as regular (a consistent axis that responds well to cylindrical lenses) or irregular (often from keratoconus or scarring, needing specialty contacts or surgery).
How Astigmatism Appears on Your Prescription
Every prescription that corrects astigmatism contains two additional values beyond the sphere (SPH):
- Cylinder (CYL): the power of astigmatism correction. Zero means no astigmatism; any non-zero value indicates astigmatism present.
- Axis: a number from 1 to 180 indicating the orientation of the cylinder correction. The lens must be positioned at this exact angle to work correctly.
To understand all the fields on your prescription, see our guide on how to read your prescription.
Symptoms of Astigmatism
- Blurry or distorted vision at all distances, near and far
- Difficulty distinguishing lines at certain orientations (letters like “H” or “T” may appear slightly warped)
- Halos or starbursts around lights at night, particularly around headlights or streetlights
- Eye strain and headaches, especially after reading or screen time
- Difficulty with low-contrast or low-light environments
Myopia vs. Astigmatism: Side-by-Side Comparison
This table covers the core differences. If you are trying to identify which condition you might have, note that these can and often do coexist.
| Feature | Myopia | Astigmatism |
|---|---|---|
| Primary cause | Eye too long or cornea too steep | Cornea or lens with irregular curvature |
| What is blurry | Distant objects | Objects at all distances |
| Near vision | Usually clear | May be blurry or distorted |
| Distortion of lines | No | Yes (straight lines may appear curved) |
| Night glare/halos | Uncommon | Common |
| Headaches | After sustained distance viewing | Frequent, in various situations |
| Prescription notation | Sphere (SPH) only, negative value | Sphere + Cylinder (CYL) + Axis |
| Corrective lens type | Diverging (concave) lens | Cylindrical (toric) lens |
| Can they coexist? | Yes, as myopic astigmatism | Yes, as myopic astigmatism |
How Each Condition Is Corrected
Three main approaches correct myopia, astigmatism, and myopic astigmatism, chosen by prescription strength, lifestyle, and patient preference.
Prescription Glasses
The most accessible option: concave lenses for myopia, cylindrical power at the prescribed axis for astigmatism, both combined for myopic astigmatism. See our prescription lenses guide for materials and coatings.
Toric Contact Lenses
Standard spherical contacts cannot correct astigmatism reliably since they rotate freely on the eye. Toric lenses fix this with a stabilization mechanism that keeps the cylindrical correction aligned to the axis, available in soft daily, bi-weekly, and monthly disposable formats as well as rigid gas-permeable (RGP) versions. A single toric lens corrects myopic astigmatism; fitting takes slightly longer since orientation must be verified by the practitioner.
Refractive Surgery (LASIK and PRK)
LASIK and PRK both reshape the cornea with a laser to permanently correct myopia, astigmatism, or myopic astigmatism.
Per the AAO’s clinical summary, a 2016 review cited by JAMA found that 99.5% of LASIK patients achieve spectacle independence and 98.6% land within ±1.0 D of the attempted correction.
| LASIK | PRK | |
|---|---|---|
| Visual recovery | 24-48 hours | 5-7 days |
| Post-operative discomfort | Minimal | Moderate for first few days |
| Preferred indication | Most patients | Thin corneas; contact sports athletes |
| Flap complication risk | Present (low) | None |
| Long-term results | Equivalent | Equivalent |
Candidacy requires stable prescription for at least one to two years, adequate corneal thickness, age 18 or older, and no active eye disease. An ophthalmologist determines candidacy after a full preoperative evaluation.
Myopia in Children: When to Act
Childhood myopia tends to progress while the eye is still growing, typically stabilizing in the mid-to-late 20s; higher final prescriptions carry increased lifetime risk of retinal detachment, glaucoma, and myopic macular degeneration.
These interventions have solid clinical evidence for slowing progression, per a 2023 systematic review of 12 randomized controlled trials (PMC10076805) and the IMI 2025 Interventions report (PMC12448128):
| Intervention | Reported Efficacy | Age Range |
|---|---|---|
| Low-dose atropine drops (0.01%-0.05%) | 27%-67% reduction in progression | 6-14 years |
| Orthokeratology (overnight lenses) | 0.30 mm less axial elongation over 2 years | 8-16 years |
| Peripheral defocus spectacles (MiYOSMART, Stellest, HAL) | 67%-87% reduction in progression | 6-18 years |
| MiSight contact lenses | 59% reduction in progression; 52% reduction in axial elongation | 8-15 years |
| Outdoor time | Protective for onset | All children |
See our myopia control guide for details on each option. Accurate measuring PD in children matters for fitting their first glasses, and for contact lens options see contact lenses for children.
Living with Myopia and Astigmatism
Night driving: Astigmatism is particularly disruptive at night: irregular focal patterns create starbursts and halos around headlights and streetlights. The correct prescription, including anti-reflective coating, reduces this significantly; mention persistent glare at your next exam.
Frame fit: Glasses for astigmatism need to sit consistently on the face. Frames that slip down the nose or sit at an angle rotate the cylinder correction out of its intended axis, reducing effectiveness, so regular adjustments matter more for high-cylinder prescriptions. See our eyewear care guide for general upkeep.
When to See an Eye Care Professional
Myopia and astigmatism progress gradually; the symptoms below are not typical of either condition and warrant prompt evaluation.
Seek urgent care (same day or ER) if you notice:
- Sudden vision loss in one or both eyes, even briefly
- New flashes of light in one eye, especially in a dark room
- A sudden increase in floaters (moving spots or threads in your vision)
- A dark curtain or shadow blocking part of your visual field
- Sudden double vision
- Severe eye pain with redness
These may indicate retinal detachment, vascular occlusion, or other ophthalmic emergencies where timing directly affects the outcome.
Routine exam schedule:
- Children: first comprehensive exam before school age; annually if myopia is present or progressing
- Adults (no complaints): every 1-2 years
- Adults with high myopia (-6.00 D or greater): annually, with focused evaluation of the retinal periphery
An ophthalmologist performs dilated fundus exams to assess retinal health, especially important for high myopes; routine visual acuity testing tracks changes between exams.
Frequently Asked Questions
Can you have both myopia and astigmatism at the same time?
Yes. This is called myopic astigmatism, one of the most common refractive error combinations: an elongated eye or overly curved cornea causes the myopia, while an irregular, football-like corneal shape causes the astigmatism. A single pair of glasses or toric contact lenses corrects both at once.
Does astigmatism get worse over time?
In most adults, astigmatism is relatively stable. It may fluctuate slightly during childhood as the eye grows, or change after corneal injury or surgery. Keratoconus, where the cornea progressively thins and steepens, causes worsening irregular astigmatism and needs specialized monitoring. Routine exams every one to two years catch meaningful changes.
Can LASIK fix both myopia and astigmatism?
Yes. LASIK and PRK both treat myopia and astigmatism at once by reshaping the cornea with a laser, correcting the sphere and cylinder in a single treatment. Candidacy depends on corneal thickness, prescription stability, and overall eye health, assessed during a preoperative evaluation.
Do I need special frames if I have a high astigmatism prescription?
Not a special frame type, but frame selection matters. High cylinder prescriptions produce lenses that are thicker along one axis than another; smaller, rounder frames minimize edge thickness and distortion. Your optician can calculate expected lens thickness for any frame from your prescription and its dimensions, or use a lens thickness calculator for an estimate before you order.
Why do my glasses feel strange if I have astigmatism?
A new or changed cylinder correction causes a brief adaptation period as the brain relearns the focal information; floors and walls may look tilted for a few days, usually resolving within one to two weeks. If distortion persists longer, ask your optician to verify the optical center and axis placement.
Is astigmatism the same as lazy eye?
No. Lazy eye (amblyopia) is a developmental condition where the brain suppresses input from one eye, reducing acuity that lenses alone cannot fully correct. Astigmatism is a refractive error caused by corneal shape. Uncorrected astigmatism in one eye during childhood can contribute to amblyopia if the brain learns to favor the other eye, which is why early correction matters.
Can I wear regular contact lenses if I have astigmatism?
Standard spherical contacts do not correct astigmatism reliably because they rotate on the eye, shifting the correction away from the intended axis. Toric contact lenses are designed to stay oriented correctly on the cornea, providing stable cylinder correction, and are available in daily, bi-weekly, and monthly formats that can correct myopia and astigmatism together.
How does having both conditions affect my prescription?
A myopic astigmatism prescription shows a negative sphere value for the myopia plus cylinder and axis values for the astigmatism, corrected by a single lens. It is no more complex to fill than either condition alone, though high sphere and cylinder together can affect lens thickness and frame selection.
The Content Above Is Educational, Not Medical Advice
This article explains myopia and astigmatism based on published clinical data and is intended for patients and eyecare professionals seeking a reference overview. It does not replace a comprehensive eye examination. If you have concerns about your vision or a diagnosis, consult a licensed optometrist or ophthalmologist.
I grew up inside an optical shop. My mother likes to tell how, as a kid, I would watch eyeglasses being assembled, play with the tools, and draw on the back of service order slips. The family business taught me early what a precise measurement and work done right are worth.
I went on to spend more than twenty years as a software engineer, always keeping an eye on the optical world. Optogrid was born where the two meet: digital measurement technology (pupillary distance and fitting heights) built by someone who knows the dispensing counter from the inside.