DIURNAL CHANGE IN CORNEAL TOPOGRAPHY AND CORNEAL THICKNESS

Randall Sakamoto

Abstract

Recent development of computer assisted corneal topography instruments allows analysis of the cornea from its center to the periphery. The wealth of data obtained from this new instrumentaiton makes new mathematical analyses also possible. We studied diurnal changes in corneal topography and corneal thickness over a 24 hour period. This study represents the first in depth study of corneal diurnal changes utilizing such instrumentation. Corneal topography was measured using the Topographical Modeling System, TMS-1 (Computed Anatomy, Inc.). Corneal thickness was measured by ultrasonic pachymetry, DGH-500 (DGH Technologies, Inc.). Five male non-contact lens wearers were selected as subjects for this study (average age 30.8). Overnight corneal swelling was 4.5% at 7:00 immediately upon waking. Two new calculations of the raw data from the TMS-1 were performed. This second calculated the amount of corneal curvature change and the statistical significance of that change for 5 distinct zones of the cornea. Significant steepening (pACCOMMODATIVE RESPONSES TO SIMPLE SINUSOIDAL AND COMPOUND GRATINGS: ROLE OF SPATIAL PHASE

Details

Year: 1992

Program Number: Poster 1

Author Affiliation: n/a

Co-Authors: Tomoko Sakamoto, Yoshitaka Miyanaga, Kazunori Co., Ltd.

Co-Author Affiliation: n/a

Room: Great Hall