Gullstrand ophthalmoscope arranged as a parallax refractionometer

Historical Significance: Gullstrand demonstrated his table top instrument in 1911. It was designed to displace corneal and lens reflections from the field of view during ophthamloscopy and was based on earlier work of Schulten (1883) and Thorner (1895) , It was later modified by Henker about 1922 so it could be used as an objective optometer. This is an example for the Henke modification. Another example is held Cat No 2026. The instrument is detailed in Emsley:Visual Optics 2nd Ed, p245 (or 5th Ed p252). Refer Cat No 871 for manual for this instrument (in German). Allvar Gullstrand (1862 - 1930) was a Swedish ophthalmologist. He was professor (1894-1927) successively of eye therapy and of optics at the University of Uppsala. He applied the methods of physical mathematics to the study of optical images and of the refraction of light in the eye. He developed the Gullstrand reduced eye. He received the Nobel Prize in Physiology or Medicine in 1911.