Related Experiment Video
Updated: Aug 7, 2026
Correction of Presbyopia by Monocular Bi-Aspheric Ablation Profile
Published on: September 20, 2024
Visual and refractive results of combined PTK/PRK in patients with corneal surface disease and refractive errors
Gerald W Zaidman1, Albert Hong
1New York Medical College, Westchester Medical Center, Department of Ophthalmology, Valhalla, New York, USA.
Purpose:
To investigate the changes in symptoms, refraction, and visual acuity (VA) in patients with corneal surface disease and refractive errors who had phototherapeutic keratectomy (PTK) combined with photorefractive keratectomy (PRK).
Setting:
University-based referral practice.
Methods:
Patients with myopia or astigmatism and map-dot-fingerprint dystrophy or recurrent erosions were treated. The corneal epithelium was removed with a 64 blade, and laser was performed using a Visx Star S3 laser.
Results:
Nineteen eyes of 14 patients were treated. Preoperatively, mean myopia was -3.76 diopters (D) (range -7.50 to -0.75 D), mean astigmatism was +0.96 D (range 0.00 to +2.25 D), and mean UCVA was 20/400. At 3 months, mean myopia was -0.53 D (range -1.75 to +0.75 D) (P<.001), mean astigmatism was +0.58 D (range 0.00 to +1.25 D) (P = .05), and mean uncorrected VA was 20/23 (P<.001). At 6 months, mean myopia was -0.31 D (range -1.00 to +0.75 D) (P<.001), mean astigmatism was +0.56 D (range 0.00 to +1.25 D) (P = .05), and mean uncorrected VA was 20/23 (P<.001). The change in astigmatism was confirmed by vector analysis. Only 1 patient lost 1 line of acuity, and all patients were asymptomatic.
Conclusion:
Patients with myopia and astigmatism and symptomatic epithelial basement membrane disorders who had PTK/PRK had resolution of their symptoms and nearly achieved emmetropia. Therefore, this procedure is safe and effective for patients with corneal surface disease and myopia.
