343 ASTIGMATISM, found in the apparent shape of the disk, which instead of being round, is more or less oval. In the erect image the Fig. 119. Fig. 118. … The same disk, seen by the Erect image of disk in astigmatism, with indirect method. (Wecker and meridian of greatest refraction nearly Jiiger.) vertical. (Wecker and Jiiger.) long axis of the oval corresponds to the meridian of greatest refraction, and is therefore, as a rule, nearly vertical…
Eye · Color blindness
Internet Archive · Yale University, Cushing/Whitney Medical Library · Public domain (published before 1931). Free to use for anything.
