To the Editor.
—In studying the article by Trobe and Glaser (Archives 96:1210-1216, 1978), I was struck by two facets that deserve mention. First, the authors refer to a color saturation difference at the vertical meridian as a hemiachromatopsia. Theoretically, the authors are actually defining a hemidyschromatopsia since there is a dysfunction of color appreciation and not a total loss of color vision in one hemifield. Secondly, the authors seem to me to have overemphasized the importance of normal central acuity, which militates against the possibility of a compressive optic neuropathy. It has been shown in the monkey that the arcuate nerve fiber bundles continue segregated even into the optic chiasm.1 Kearns and Rucker in 1958 reported four cases of arcuate defects in patients with chromophobe adenomas.2 Harrington has recorded nine case reports of middle cranial fossa lesions that resulted in arcuate scotomas.3 It must be remembered
Laibovitz RA. Perspective on Perimetry. Arch Ophthalmol. 1979;97(4):775. doi:10.1001/archopht.1979.01020010411031