SCHEMATIC EYE FOR THE OPOSSUM

Schematic values were determined for the elements of the dioptric system of the eye of a marsupial. D. marsupialis aurita. Based on measurements on excised eyes a schematic eye was developed for this species. The following aspects of the opossum's eye are discussed: real, entrance and exit pupils, retinal illumination and uniocular optical field. The extent of the retinal visual field was determined and the resulting cyclopic field established. The position of the blind and optic axes in space were indirectly determined by correlating the posture of the head under experimental and normal conditions, and the horizontal meridian was found to lie 4° below the blind axis. © 1979.