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Abstract
Abstract
Does the Fovea Move towards the Optic Disc with Increasing Age?
Keilhauer C. N.1, Zollmann J.1, Schrader W. F.1, Delori F. C.2
1Universitätsaugenklinik Würzburg; 2Schepens Eye Research Institute (SERI) Boston/USA
Purpose: It is well known that the fovea on average is settled below a horizontal through the optic disk. To asses if it stays at this position throughout life is the purpose of this study.
Method: Images of HRA AF (30°) were analyzed. Subjects were included (ages 20-80 years) who had images of both eyes, and where 3/4 of the disc was in the image. To minimize the effect of head-tilt we only included subjects where the difference in angle theta (angle between a horizontal through the center of the disk and the line connecting the center of the disk to the fovea) for both eyes was less than 5°, and then averaged the data of both eyes. A correction for a slight magnification change across the HRA image was also included.
Results: The total number of subjects was 28 (F/M=16/12). The fovea is on average 15.1±0.8° (visual field angle) temporally to the center of the disk, and 1.8±0.5° inferior to the center of the disk (n=75). The angle theta was 6.9±2.2° (angle in the retinal plane). The distance disk-fovea was 15.3±0.8°. The vertical distance between the centers of fovea and the disc increases significantly with age (p=0.006), reflecting a relative "displacement" of the fovea in the inferior direction as age increases. The magnitude was about 1° between the ages of 20 and 80 years. No signi