Short answer
Myopia (short-sightedness) blurs distance vision — minus (−) Sph on your prescription. Astigmatism blurs and distorts at all distances — a Cyl (cylinder) value on your prescription. They are different errors but very commonly occur together (e.g. −4.00 / −1.50 × 180) and both are corrected in one LASIK, SMILE, or ICL session.
Myopia vs astigmatism at a glance
Myopia is about eye length or corneal steepness — distance blur. Astigmatism is about uneven corneal curvature — smeared vision at every distance. Most people with myopia also have some astigmatism.
| Feature | Myopia | Astigmatism |
|---|---|---|
| Prescription column | Sph (sphere) — minus, e.g. −4.50 | Cyl (cylinder) + Axis, e.g. −1.50 × 180 |
| What blurs | Distance — near usually sharp | All distances — smeared or doubled |
| Cause | Eyeball too long or cornea too steep | Cornea curved like a rugby ball, not a football |
| Light focus | In front of the retina | Two focal points — not one sharp image |
| Classic symptoms | Squinting at road signs, sitting close to TV | Starbursts at night, stretched letters, eye strain |
| Can occur alone? | Yes — pure myopia with zero Cyl | Yes — but often combined with myopia or hyperopia |
| Laser surgery | LASIK · SMILE · ICL | Same — both corrected together |
Which blur pattern fits you?
- Distance blurry, reading fine, no distortion → likely pure myopia.
- Everything smeared or doubled — near and far → likely astigmatism, with or without myopia.
- Distance blur plus starbursts at night → myopia and astigmatism combined — very common.
- Reading strains but distance OK → consider hyperopia or presbyopia, not myopia alone.
Reading a combined prescription
−5.50 / −1.75 × 85 means −5.50 D myopia + −1.75 D astigmatism at axis 85°. Both numbers are corrected in one procedure.
- Sph−5.50 = myopia strength (minus = short-sighted)
- Cyl−1.75 = astigmatism strength
- ×85 = axis — orientation of the steeper corneal meridian (0–180°)
See prescription tables on the myopia guide and astigmatism guide.
Can surgery fix myopia and astigmatism together?
Yes. LASIK, SMILE Pro, and toric ICL treat myopia (Sph) and astigmatism (Cyl) in a single session — one recovery, one cost.
Astigmatism does not prevent laser eye surgery — it is one of the conditions laser is designed to correct. Irregular astigmatism from keratoconus must be ruled out with tomography first. Regular astigmatism combined with myopia is routine at high-volume clinics.
Compare procedures: LASIK vs SMILE · LASIK vs ICL.
Pure myopia vs pure astigmatism
Pure myopia (Cyl = 0) is common in mild short-sightedness. Pure astigmatism without myopia or hyperopia exists but is less frequent — you would see a Cyl value with Sph at zero or plano. Most surgical patients present with combined errors because astigmatism rarely exists in isolation at clinically significant levels.
Have both Sph and Cyl?
Share your full prescription — we confirm whether one procedure covers both.
Minus sphere plus cylinder — honest LASIK, SMILE, or ICL answer within 2 hours.
Return to: Myopia guide · Astigmatism guide · Myopia vs hyperopia