CHANGES IN REFRACTIVE TRENDS AND OPTICAL COMPONENTS AFTER AGE FORTY

Title CHANGES IN REFRACTIVE TRENDS AND OPTICAL COMPONENTS AFTER AGE FORTY
Author, Co-Author Carly S.Y.Lam, Winnie S.H.Goh
Topic
Year
1992
Day
Sunday
Program Number
Poster 63
Room
Great Hall
Affiliation
Abstract The age trends of refractive errors, astigmatism and the optical components were studied in 220 Chinese subjects aged more than forty years in a cross-sectional study. Subjective refraction, corneal curvatures and ocular biometry were performed on 136 female and 84 male subjects. Corneal curvatures were measured with a Topcon topographical keratometer and ocular biometry was measured with the Storz Omega Biometer. The results showed that myopia did not dominate in this age agoup. The mean spherical equivalent equals -0.19D for females and -0.45D for males. With increasing age, the prevalence of hyperopia increases from 2% at age 40-45 years to 66% at age over 65 years. A higher percentage of against the rule astigmatism appears in both refractive and corneal components. Significant positive correlations were found between age and spherical equivalent power. Negative correlations were found between age and vitreous depth and axial length. There was also a significant shift of the axis towards against the rule astigmatism with increasing age in both refractive and corneal astigmatism. No sex differences were found in any of these parameters. Significant differences in the refractive errors and their distribution were observed from this group as compared to the other younger age groups. Myopia appears to be a new development among the younger age groups of the Chinese population, and the importance of genetics in determination of refractive error is called into question by these findings.
Affiliation of Co-Authors
Outline