[Relation of color-coordinate transposition in temporal papillary pallor to visual acuity].

The authors first described the method of fundus color measurement by visual comparison in 1974, and by its use the clinician is able to follow the development of optic disc atrophy or diseases in which hyperemia is seen by using quantitatively defined color coordinates. Color coordinates of the nasal and temporal papillary halves in 100 normal eyes are demonstrated in the x and y plane. The palor range in atrophy is in the upper left part of the scale in comparison to normality. The mathematical relationship between visual acuity and temporal papillary palor is demonstrated in a defined group of 98 eyes. A formula has been derived with which the probable visual acuity can be calculated from the measured color coordinates and its clinical use is described.