Navegando por Palavras-chave "photorefractive keratectomy"

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    Photorefractive Keratectomy With Mitomycin C After Penetrating and Lamellar Keratoplasty
    (Lippincott Williams & Wilkins, 2010-10-01) Forseto, Adriana dos Santos; Marques, Junia Cabral; Nose, Walton [UNIFESP]; Eye Clin Day Hosp; Universidade Federal de São Paulo (UNIFESP)
    Purpose: To assess the safety and efficacy of photorefractive keratectomy with mitomycin C (PRK-MMC) to correct refractive errors after corneal transplantation.Methods: This was a prospective and noncomparative study of 36 eyes that underwent PRK-MMC after penetrating (n = 34) or lamellar (n = 2) keratoplasty. After mechanical epithelial removal and photoablation, a sponge with mitomycin C 0.02% was applied to the stromal bed for 1 minute. the uncorrected and best-corrected visual acuities, refraction, and complications were assessed.Results: the average follow-up was 16.27 +/- 8.38 months (range, 6-30.5 months). the spherical equivalent decreased from -3.95 +/- 4.11 to -1.07 +/- 1.45 diopters (D) postoperatively (P < 0.001). the mean preoperative astigmatism was 4.42 +/- 1.69 D (range, 1.00-7.25 D); however, surgical correction was limited to 6.00 D. Vector analysis of astigmatic correction showed an index of success of 55%. At the last follow-up, 41.7% (n = 15) and 61.1% (n = 22) of the eyes were within +/- 0.50 and +/- 1.00 D of emmetropia, respectively. Nineteen eyes (52.8%) achieved an uncorrected visual acuity of 20/40 or better. the best-corrected visual acuity remained within 1 line of the preoperative values in 26 cases (72.2%), improved in 8 (22.2%), and decreased in 2 (5.6%). Endothelial cell decompensation was observed in 1 eye (2.8%) 11 months postoperatively, and haze developed in 3 cases (8.3%).Conclusions: PRK-MMC may be an option to correct refractive errors after keratoplasty. A low preoperative endothelial cell count and haze may affect the safety outcomes.
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    Photorefractive Keratectomy With Mitomycin-C for Consecutive Hyperopia After Radial Keratotomy
    (Lippincott Williams & Wilkins, 2009-05-01) Anbar, Roberto [UNIFESP]; Malta, Joao Baptista [UNIFESP]; Barbosa, Jose Bonifacio [UNIFESP]; Leoratti, Maria Cristina Ventura [UNIFESP]; Beer, Sandra Maria Canelas [UNIFESP]; Campos, Mauro Silveira de Queiroz [UNIFESP]; Univ Michigan; Universidade Federal de São Paulo (UNIFESP)
    Purpose: To evaluate the satiety, efficacy, and stability of excimer laser photorefractive keratectomy (PRK) and mitomycin-C (MMC) 0.02% for consecutive hyperopia after radial keratotomy (RK).Methods: A prospective, nonrandomized, noncomparative interventional case series of 35 eyes (22 patients) with consecutive hyperopia after RK. All eyes were treated with PRK, using a single intraoperative topical application of MMC 0.02% for 60 seconds. Uncorrected visual acuity, best spectacle-corrected visual acuity, refraction, slit-lamp evidence of corneal haze, and endothelial cell Counts were evaluated for up to 18 months after surgery.Results: Postoperative follow-up was 9.6 +/- 5.5 months (ranged from 3 to 18 months). The mean spherical equivalent was +3.36 +/- 1.94 diopters preoperatively and +0.27 +/- 1.38 diopters 12 months after surgery. The uncorrected visual acuity was >= 20/30 in 37.1% of the eyes at I month and 78.6% of the eyes at 12 months. At 12 months, 14% of the eyes lost LIP to I line of Snellen acuity ill the best spectacle-corrected visual acuity No corneal haze was observed and the endothelial cell counts remained unchanged postoperatively (P > 0.05).Conclusion: PRK with MMC 0.02% for Consecutive hyperopia after RK seems to be a safe and effective procedure at least in the short-term period of 6 months.