Asymmetry and variation in the normal hill of vision
J. Katz and A. Sommer
This analysis describes the symmetry and variation in the shape and height
of the "hill of vision" obtained from automated static visual field testing
of 146 normal eyes of 81 people aged 20 to 78 years. Threshold values
dropped from the center to the 30 degrees periphery, with the greatest
decrease occurring in the superior quadrant. Variability also increased
with distance from the center of fixation, with the greatest variability
occurring in the superior quadrant. Threshold values were lower throughout
the field in individuals over age 60 years compared with those who were
younger, with the greatest decrease in thresholds occurring in the superior
quadrant. This age effect was not explained by differences in pupil
diameter or central acuity. Variability was higher in the older group, but
only in the periphery (greater than 24 degrees from fixation).
