Corneal elevation and keratoconus indices in a 40- to 64-year-old population, Shahroud Eye Study

摘要

Purpose To determine the corneal elevation values and keratoconus indices in the 40- to 64-year-old population and their changes with aging. Methods The 6311 invitees of this study were selected through random cluster sampling, and 5190 of them participated in the study (response rate?=?82.2%). Here, we analyzed results of Pentacam acquisitions in 4148 respondents. Cases of keratoconus and forme fruste keratoconus (FFKC) were determined using topography and clinical data. Studied variables included keratoconus indices, central corneal thickness readings, maximum elevations on the anterior and posterior surfaces, and elevation values at the thinnest point, anterior steepest point, and posterior steepest point in healthy, FFKC, and keratoconus groups. Results In all subjects, the mean maximum elevations were 6.80?±?5.0?μm and 16.60?±?7.7?μm on the anterior and posterior corneal surfaces, respectively. Maximum elevation values on the anterior and posterior corneal surfaces showed significant correlations in the keratoconus, FFKC, and healthy groups (P?