To the Editor.
—We would like to remark on the article in the Archives by Katz and Sommer.1 Using the Humphrey visual field analyzer, the authors found, in normal eyes, a nonlinear decay of the sensitivity toward the periphery. The slope of the decay was dependent on the direction. The sensitivity was most depressed in the superior quadrant. They also found a significant age influence at all test locations. These findings confirm those of previous studies2 and are well in line with the normal values stored in the memory of the OCTOPUS automated perimeter system.3In addition, the authors found the age influence to be different in different visual field areas. This age influence was larger in the periphery than in the center and larger in the upper half of the visual field than in the lower half. These findings are also in agreement with an OCTOPUS
Flammer J, Bebie H. Influence of Age on Quantitative Perimetry. Arch Ophthalmol. 1987;105(1):24. doi:10.1001/archopht.1987.01060010026013