CORNEAL CURVATURE AND INTERPUPILLARY DISTANCE MEASUREMENTS IN A SOUTH AFRICAN RURAL BLACK POPULATION.

Tuwani Rasengane

Abstract

PURPOSE. Corneal curvature is an important measurement in selecting contact lens parameters and the interpupillary distance (IPD) is necessary for spectacle dispensing. The magnitudes of the two measurements have been found to vary with race. Currently no data have been reported for the South African Blacks. This study reports the corneal radius of curvature and IPD among rural black South Africans. METHOD. The radius of curvature and far IPD were measured using the Canon RK-2 autokeratometer/refractor and a millimeter ruler in 200 adults aged 18-50 years.

RESULTS. IPD ranged from 58 to 74 mm with the mean of 67 mm (±0.53 SE). Males had slightly wider IPD than females. The corneal radius of curvature ranged from 7.27 to 8.66 mm with the mean radius of curvature of 7.75 mm (±0.04 SE). Although hyperopes tended to have flatter corneas than the myopes, the difference was not statistically significant.

CONCLUSIONS. This study shows that the South African rural blacks have wider IPD as compared to the studies done on African Americans and other races. The wide IPD may be related to wide temple width observed in blacks. The corneal radius of curvature is comparable to the reported values from studies on other racial groups.

Details

Year: 2001

Program Number: Poster 90

Author Affiliation: Rand Afrikaans University

Co-Authors: Anthony Carlson

Co-Author Affiliation: n/a

Room: Exhibit Hall C