Calibration device for use with fundus camera

Patent Pending Fundus photography is performed by a fundus camera, which basically consists of a specialized low power microscope with an attached camera.The optical design of fundus cameras is based on the principle of monocular indirect ophthalmoscopy.[2][3] A fundus camera provides an upright, magnified view of the fundus. A typical camera views 30 to 50° of retinal area, with a magnification of 2.5x, and allows some modification of this relationship through zoom or auxiliary lenses from 15°, which provides 5x magnification, to 140° with a wide angle lens, which minifies the image by half.