Before revision: To measure visual acuity, in 1835 German ophthalmologist, Heinrich Kuehler , made the first eye chart consisting of pictures of objects or alphabetic letters of decreasing size that patients were to identify.
After revision: To measure visual acuity, in 1835 German ophthalmologist, Heinrich Küchler , made the first eye chart consisting of pictures of objects or alphabetic letters of decreasing size that patients were to identify.