Ogle, Kenneth N.

A high speed flash tube is adapted to the Nordensen retinal camera, so that the fundus of the human eye can be photographed in color. The high speed flash eliminates the usually deleterious effect of blinking and eye movements. Special electronic circuits are needed to provide a flickering light from the same flash tube to enable the operator to adjust and focus the camera. Ektachrome film is used and this is over-developed to gain equivalent exposure. For the fundus photographs this apparently results in no loss of color relationships.