RESUMO
PURPOSE: To report the front corneal versus central and paracentral corneal changes after Bowman layer transplantation for keratoconus in a tertiary hospital in the United Kingdom. METHODS: Five eyes of 5 patients receiving Bowman layer transplant for advanced keratoconus in Royal Gwent Hospital (Newport, United Kingdom) were included. Preoperative and postoperative visual acuity; Kmax; Kmean, and corneal cylinder in the front cornea, 4.5 mm central, and 6 mm central; and corneal thickness were analyzed. RESULTS: Corneal flattening and reduction in corneal astigmatism was observed, more marked in the central and paracentral zone, allowing for improvement in best-corrected visual acuity with the aid of visual correction in 4 eyes. CONCLUSIONS: These results support previous data reporting Bowman layer transplantation as a useful strategy in the treatment of advanced keratoconus and suggest greater attention may be focused on central or paracentral corneal changes.
Assuntos
Córnea/diagnóstico por imagem , Paquimetria Corneana/métodos , Topografia da Córnea/métodos , Transplante de Córnea/métodos , Ceratocone/cirurgia , Refração Ocular/fisiologia , Adulto , Feminino , Seguimentos , Humanos , Ceratocone/diagnóstico , Ceratocone/fisiopatologia , Masculino , Período Pós-Operatório , Estudos Retrospectivos , Resultado do Tratamento , Adulto JovemRESUMO
PURPOSE: To find out the interrelationships between 3 parameters of the keratoconic cone. METHODS: A total of 101 keratoconic eyes of 58 patients were included in this retrospective case series study. A complete eye examination was performed. Kmax (K) and pachymetry at the thinnest point (T) were obtained from the Pentacam tomographer. The vertex to thinnest pachymetry distance (D for decentration) was calculated using trigonometry. Pearson correlation coefficients between T and D, between T and K, and between D and K were calculated. RESULTS: There is a statistically significant positive correlation between thinnest point pachymetry and decentration (R = 0.366, P = 0.0002) and also statistically significant negative correlation between thinnest point pachymetry and Kmax (R = -0.719, P < 0.00001) and decentration and Kmax (R = -0.281, P = 0.0044). CONCLUSIONS: The interrelationships between the 3 keratoconic cone parameters suggest that the thinner cones are largely central, that is, decenter less, but show greater steepening.
