Astigmatism is an extremely common refractive error, often associated with myopia. Today, laser astigmatism correction makes it possible to treat both conditions simultaneously in a single procedure, giving patients sharp vision without glasses or contact lenses. Discover everything you need to know about this modern refractive surgery, its techniques, its results and who is eligible.
Understanding astigmatism and its impact on vision
Astigmatism results from an irregular curvature of the cornea, which takes on an oval ("toric") shape rather than a spherical one. This asymmetry distorts the image projected onto the retina, causing blurred or doubled vision at every distance. When astigmatism is combined with myopia — which concerns roughly 60% of short-sighted patients — visual discomfort is amplified both at distance and up close. Without appropriate treatment such as laser astigmatism correction, these symptoms tend to worsen over time. Common symptoms include:
- Overall blurred vision: images are imprecise regardless of the viewing distance;
- Eye strain: constant accommodative effort causing headaches and discomfort;
- Contrast confusion: difficulty distinguishing similar letters (H, M, N) or similar digits;
- Night-time glare: distracting light halos when driving at night.
It is precisely to address this everyday functional discomfort that laser astigmatism correction has now become the gold-standard solution.
How laser astigmatism correction works
The principle of laser astigmatism correction relies on reshaping the cornea with an excimer laser. Guided by extremely precise corneal mapping (topography and aberrometry), this laser selectively sculpts the corneal tissue to restore a regular, symmetrical curvature. Unlike a myopic cornea that simply needs to be flattened, an astigmatic cornea requires differentiated treatment along its axes — known as toric treatment. The laser removes more tissue along the steepest axis and less along the flattest one, thereby restoring a uniform optical surface. This correction takes only a few seconds and can be performed simultaneously with the correction of myopia, hyperopia or presbyopia. It is this versatility that makes laser astigmatism correction a particularly efficient procedure.
LASIK and PRK: two techniques for laser astigmatism correction
Two main techniques can deliver laser astigmatism correction. The choice between them depends on corneal thickness, the degree of refractive error and the patient's profile.
- LASIK: the reference technique, combining the creation of a corneal flap with the femtosecond laser followed by the application of the excimer laser to the stroma. Visual recovery is fast (24 to 48 hours) and virtually painless. LASIK can correct astigmatism up to 5 or 6 dioptres combined with myopia up to -10 dioptres;
- PRK: a surface technique in which the excimer laser is applied directly after removing the corneal epithelium, with no flap created. PRK is preferred for thin corneas, profiles at risk of ocular trauma (combat-sport athletes, law-enforcement officers) or when LASIK is contraindicated. Recovery is more gradual (5 to 7 days) but long-term results are equivalent.
In both cases, the procedure is performed on an outpatient basis, under topical anaesthesia (eye drops), and lasts less than 15 minutes for both eyes. Whichever method is chosen, laser astigmatism correction offers treatment precision unmatched by traditional optical means.
Results of laser astigmatism correction: what to expect
The results of astigmatism surgery are now remarkable thanks to the technological progress of the latest-generation platforms. According to published clinical studies, more than 95% of operated patients achieve 20/20 uncorrected visual acuity after a procedure combined with myopia. The satisfaction rate exceeds 98%. As for laser astigmatism correction, the data show that residual astigmatism below 0.50 dioptre — clinically non-significant — is achieved in more than 90% of cases. The stability of results is excellent in the long term, with regression being rare when the surgical indications are respected. Severe complications remain exceptional (less than 0.1%), which makes laser astigmatism correction one of the safest procedures in modern surgery.
Ideal candidates for laser astigmatism correction
Not all astigmatic patients are eligible for surgery. A complete pre-operative assessment determines the ideal candidates for laser astigmatism correction. Eligibility criteria include:
- Minimum age of 20-21 years: refraction must have been stable for at least one year;
- Sufficient corneal thickness: generally above 500 microns for LASIK, with a safe residual stromal bed after surgery;
- Regular astigmatism: irregular astigmatism or astigmatism linked to keratoconus are absolute contraindications;
- No progressive ocular disease: no uncontrolled glaucoma, cataract or degenerative corneal disease;
- Realistic motivation: the patient must understand the expected benefits and the potential limits of the procedure.
Corneal topography, pachymetry and aberrometry are the key examinations used to safely confirm the indication for laser astigmatism correction. These examinations are systematically performed at the first consultation dedicated to laser astigmatism correction.
How the laser astigmatism procedure unfolds
On the day of the procedure, the patient is welcomed into the operating room and positioned under the surgical microscope. Anaesthetic eye drops are instilled to eliminate any pain. With LASIK, the femtosecond laser cuts a thin corneal flap in about 15 seconds, then the excimer laser reshapes the cornea according to the calculated profile — correcting both myopia and astigmatism. The flap is then repositioned and adheres naturally without sutures. For PRK, the epithelium is removed with an alcohol solution or mechanical brushing before the excimer laser is applied. A bandage contact lens is placed to protect the cornea during healing. Thanks to the optimised protocols of laser astigmatism correction, the patient leaves the surgical centre about 30 minutes after arriving, with a prescription for post-operative eye drops (antibiotics, anti-inflammatories, artificial tears).
When to consult Dr Gozlan for laser astigmatism correction
It is advisable to seek advice as soon as your astigmatism and myopia affect your daily quality of life: dependence on glasses or contact lenses, professional visual discomfort, limited sports activity or simply the desire for visual freedom. A complete assessment with a view to laser astigmatism correction will confirm your eligibility and let us propose the technique best suited to your situation. The sooner the diagnosis is made, the sooner you can benefit from the advances of refractive surgery.
📍 Consultation at the Paris – Auteuil Ophthalmology Practice
Dr Gozlan, an ophthalmic surgeon specialising in refractive surgery at the Paris – Auteuil Ophthalmology Practice, welcomes you for your pre-operative assessment and your complete care.
Book an Appointment on DoctolibFAQ: laser astigmatism correction — frequently asked questions
Can astigmatism and myopia be corrected in a single laser session?
Yes, laser astigmatism correction makes it possible to treat myopia and astigmatism simultaneously during the same procedure. The excimer laser applies a combined ablation profile, correcting both errors in a few seconds per eye.
Is laser astigmatism correction painful?
The procedure is painless thanks to anaesthetic eye drops. With LASIK, post-operative discomfort is minimal (tingling for a few hours). With PRK, moderate discomfort may last 2 to 3 days, well controlled by the prescribed painkillers.
How much astigmatism can be corrected with the laser?
Laser astigmatism correction effectively treats regular astigmatism up to around 5-6 dioptres. Beyond that, or in cases of irregular astigmatism, other surgical solutions (toric implants) may be considered after a full evaluation.
Can astigmatism come back after laser surgery?
Recurrence of significant astigmatism after a properly performed procedure is rare (less than 3% of cases). If residual astigmatism appears, a laser touch-up is generally possible in the months following the initial procedure.
How long is recovery after laser astigmatism correction?
With LASIK, functional recovery is fast: most patients regain sharp vision as early as the next day. With PRK, complete visual stabilisation takes 2 to 4 weeks, although vision is functional from the first week.
Further reading
- LASIK: the most widespread refractive technique for myopia;
- PRK: an alternative for thin corneas or contact-sport athletes;
- LASIK vs PRK comparison: every difference explained.