Optic dik ovality a an index of tilt and it relationhip to myopia and perimetry

Purpoe To examine the aociation of optic dik ovality with myopic refractive error, axial length, and the viual field. Deign Propective obervational cae erie. Method The tudy included 150 randomly recruited male ubject with myopia. In all cae, one eye wa randomly elected, and ubjective refraction, lit-lamp examination, applanation tonometry, goniocopy, A-can ultraonography, funducopy, and color optic dik tereo photography were performed. Dik ovality wa aeed uing the ratio of minimum to maximum dik diameter (index of tilt). A ratio of ≤ 0.8 wa conidered a ignificant dik tilt. Viual field were teted uing tatic automated threhold perimetry with two method of optical correction: trial lene and contact lene. Reult Of the total ample, 137 ubject completed the tudy. Mean age wa 21.2 ± 1.1 year, and mean pherical equivalent wa -6.36 ± 3.56 diopter. Mean ovality ratio wa 0.83 ± 0.09; 55 ubject (40.2%) had ignificant tilted optic dik. Greater optic dik ovality (tilt) correlated with greater myopia (P = .009) and longer axial length (P = .009); 95.6% of ubject had normal viual field with both method of optical correction. Uing multiple linear regreion analyi, greater tilt wa independently related to a higher mean defect on teting with trial lene (P < .01). Concluion Increaed optic dik tilt wa aociated with higher myopia and reduced enitivity on field teting. Thee factor are important in the aement of glaucoma in patient with myopia.