Danish ophthalmologist. Born in 1851, died in 1920. He left the Ribe Cathedral in Denmark in 1869 and completed his medical degree in Copenhagen in 1876. Inspired by Hansen Grout, he quickly became interested in ophthalmology and was appointed as an assistant to Hansen Grout in 1879. Bjerrum's scientific concern is the form of visual perception and the local resolution of the retina. The relationship between capabilities. He argued this in the title "UndersØgeleserofFormsans og Lyssands iforskelligeØjensyngdomme" (a survey of the morphological and light perception of various eye diseases). This title was deliberately given by Denmark, indicating that he must write his publication in Danish throughout his life. Bjerrum scotoma: The visual field defect feature of glaucoma. It is a nerve fiber bundle defect extending from a blind spot, swept around the macula area and ends in a straight line on the nasal side corresponding to the medial temporal sulcus in the retina.