To the Editor.
—We read with great interest the article by Mindel et al1 in the June Archives entitled "Visual Field Testing with Red Targets."The authors stated that visual field defects demonstrated with an isopter for chromatic recognition of a 3-mm red stimulus could always be reproduced with an isopter for achromatic recognition of a dim, 3-mm white stimulus. Although we believe these data to be basically correct, in our opinion the authors miss a basic advantage of color as compared with black and white perimetry. The authors cite data on retinal ganglion cells2-4 with the conclusion that "different retinal ganglion cells receive and convey information from different portions of the spectrum. A lesion could selectively impair those ganglion cell axons responsible for the perception of a given color."This physiological interpretation, however, does not fit current theoretical considerations of retinal information transmission. According to Boynton,5
Paulus WM. Neurophysiologic Basis of Color Perimetry. Arch Ophthalmol. 1984;102(4):508. doi:10.1001/archopht.1984.01040030394005