Excimer laser photorefractive keratectomy to correct astigmatism

Related Experiment Video

Updated: Nov 4, 2026

Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile

Published on: September 20, 2024

C Gallinaro¹, P J Toulemont, B Cochener

¹Hôpital Morvan, Service d'Ophtalmologie, Brest, France.

Journal of Cataract and Refractive Surgery

|June 1, 1996

Abstract

Purpose:

To evaluate the efficacy of excimer laser photorefractive keratectomy (PRK) to correct astigmatism.

Setting:

Hôpital Morvan, Brest, France.

Methods:

A 193 nm excimer laser was used to perform toric ablation with an expanding slit to flatten the cornea in the steeper meridian and/or to correct myopia with an iris diaphragm in 72 eyes (55 patients): 68 eyes for compound myopic astigmatism and 4 for astigmatism only.

Results:

Preoperative cylinder was -2.14 diopters (D) +/- 1.99 (SD) (range -0.50 to -5.50 D); 6 months postoperatively, it was -1.75 +/- 1.34 D (range -0.25 to -5.25 D). Preoperative spherical equivalent was -5.33 +/- 3.22 D (range -0.25 to -14.50 D); 6 months postoperatively, it was -0.86 +/- 2.32 D (range 2.50 to -9.75 D). The axial error was within 30 degrees. Uncorrected visual acuity was 0.50 or better in 64.5% of patients.

Conclusions:

Overall patient satisfaction seemed the result of the myopic correction; cylindrical correction was incomplete. Future software refinements should improve the results. In particular, single elliptical ablation seems to offer theoretical advantages.

Related Concept Videos

Focusing of Light in the Eye

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...

Angle Closure Glaucoma: Treatment

Angle Closure Glaucoma: Treatment

Angle-closure glaucoma, or closed-angle glaucoma, is an eye condition where the iris bulges out and blocks the iridocorneal angle, resulting in a buildup of aqueous humor and increased intraocular pressure. Immediate medical attention is necessary due to the sudden onset of symptoms. The treatment for angle-closure glaucoma includes short-term and long-term approaches. Short-term treatment involves using eye drops like pilocarpine to lower intraocular pressure by increasing aqueous humor...

Articles linked to this work by shared authors, journal, and citation graph.

Study protocol for a randomised controlled trial to evaluate the prophylactic efficacy of combined intense pulsed light (IPL) and low-level light therapy (LLLT) in preventing laser corneal refractive surgery-induced dry eye: the Treat Eye Before Laser induced Dry (TEBeLiD) study.

BMJ open·2026

Incidence and risk factors for retinal detachment following implantation with a multifocal or EDOF IOL: A 15-year follow-up.

Journal francais d'ophtalmologie·2025

A randomised study comparing performance and safety of Eyestil Plus® vs Vismed Multi® in moderate-to-severe dry eye syndrome patients.

European journal of ophthalmology·2024

3-month post-procedural evaluation of a combined intense pulsed light and photo-biomodulation system in the treatment of meibomian gland dysfunction.

Journal francais d'ophtalmologie·2023

Impact of virtual reality headset use on eye blinking and lipid layer thickness.

Journal francais d'ophtalmologie·2021

Cascaded multi-scale convolutional encoder-decoders for breast mass segmentation in high-resolution mammograms.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference·2020

See all related articles