[Field of vision established by perimetry in achromatopsia (author's transl)].

The results of perimetry especially of profile perimetry is in cases of achromatopsia so typical and unmistakable that it can be referred to for the differentia. l diagnosis of this disease. This follows from an examination of 33 cases with congenital achromatopsia. In all cases profile perimetry was flattened in the fixation area but not nearly as strong as it is usually the case if visual acuity is decreased to 0,1. 7 times there was found a small central scotoma at the margin of which it is fixated. The reason for the diverging of light difference sensitivity and visual acuity is discussed.