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Excimer laser photorefractive keratectomy for hyperopia

D Dausch¹, R Klein, E Schröder

¹Department of Ophthalmology, Marienhospital, Amberg, Germany.

Refractive & Corneal Surgery

|January 1, 1993

Summary

Excimer laser photorefractive keratectomy is effective for hyperopia up to +7.5 D, with good predictability. However, results for highly hyperopic or aphakic eyes are less encouraging, with a risk of visual acuity loss due to ablation zone decentration.

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Area of Science:

Ophthalmology
Refractive Surgery
Excimer Laser Technology

Background:

Excimer laser photorefractive keratectomy (PRK) is a recognized method for myopia correction.
This study investigates the efficacy of PRK for hyperopia correction using a specific excimer laser system.

Purpose of the Study:

To evaluate the outcomes of excimer laser photorefractive keratectomy in correcting hyperopia.
To assess the safety and predictability of the procedure in different degrees of hyperopia, including aphakic eyes.

Main Methods:

A prospective clinical study involving 23 hyperopic eyes (15 simple hyperopic, 8 aphakic).
Utilized a MEL 60 excimer laser (193 nm) for photorefractive keratectomy.
Followed patients for 12 months, analyzing refractive error and visual acuity.

Main Results:

80% of simple hyperopic eyes (+2.0 to +7.5 D) achieved correction within +/- 1.0 D after 1 year.
Only 37% of aphakic eyes (+11.0 to +16.0 D) were within +/- 1.0 D of the target refraction.
Visual acuity remained stable in most simple hyperopic eyes, but two aphakic eyes experienced reduced best spectacle-corrected visual acuity due to decentration.

Conclusions:

Photorefractive keratectomy is efficient and safe for hyperopia up to +7.5 D with good predictability.
PRK outcomes for highly hyperopic (aphakic) eyes are less favorable.
Careful centration of the ablation zone is crucial to avoid visual acuity loss, especially in aphakic eyes.

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