ACONUS inferior, which is spoken of in English-speaking countries as the Fuchs coloboma, after my father, is located below and either to the temporal or to the nasal side of the disk. It sometimes has a horizontal1 or a somewhat oblique straight line at the edge of the disk and is characterized by the fact that the lower half of the fundus usually has less pigmentation than the upper half. The error of refraction of the lower half of the fundus is also frequently greater than that of the upper. Myopia is found in a majority of the cases. In histologic sections, a thinning of the sclera has been noted in the lower quadrants.2
A nasal conus3 occurs less frequently than the inferior conus and often shows a lesser degree of pigmentation of the fundus on the nasal side and occasionally a bulging of the sclera, which