Analysis of Transepithelial PRK Efficiency for Middle-Degree Myopia Correction (Presented in Russian)
Narrative Responses:
Purpose
To study the effectiveness of transepithelial photorefractive keratectomy compared to laser subepithelial keratectomy for myopia middle degree correction.
Methods
We observed 38 patients (76 eyes) aged 19 to 37 years with middle degree myopia. Study group comprised 17 patients (34 eyes) who underwent transepithelial PRK. Comparison group were 21 patients (42 eyes) who underwent LASEK. In both cases, mitomycin C applique was used. Laser ablation was performed on excimer laser Allegretto Wave Eye-Q (Alcon). The patients underwent: visometry, refractometry, biomicroscopy, fluorescein test. Were estimated subjective complaints: the severity of foreign body sensation, photophobia, lacrimation, winking spasm (corneal syndrome). We took into account the degree of epithelialization, the presence of edema of the epithelium, Hayes.
Results
Visual acuity in the early postoperative period in study group was 0.84 ± 0.06 units, (P <0.01), in the comparison group – 0.53 ± 0.04 units, (P <0.01). The corneal syndrome duration in the study group patients was on 1.4 ± 0.7 days shorter and corneal edema was held on 3.4 ± 0.8 days faster than in the comparison group. After the soft contact lenses removal in 19% of comparison group subjective complaints persisted. There were no subjective complaints in the study group. Was determined early Hayes in 9.5% comparison group patients, in the study group Hayes was absent.
Conclusion
1. The transepithelial PRK using for a middle degree of myopia correction reduces the rehabilitation period and decrease the severity of corneal syndrome. 2. The obtained data allow us to recommend the introduction of transepithelial PRK in the broad ophthalmology practice for patients who are contraindicated for LASIK.