The non-linear projection of the retinal image has significant implications in both clinical ophthalmology and physiological optics, and was therefore considered by several early investigators, whose work culminated in that of Stine (I934), who obtained quantitative results by calculation. In an unpublished study on the Hering Hillebrand Horopter Deviation, it became necessary to re-evaluate this property of the retinal image in the light of contemporary knowledge of ocular dimensions, and some information of a wider relevance has emerged. Many schematic eyes have been proposed as a model of the eye's optical function. These vary in complexity from the simple reduced eye of Listing (I853) to the recent example proposed by Pomerantzeff, Govignon, and Schepens (I971), which has a lens cortex with 98 layers. It seemed possible, however, that such complexity was unnecessary for the purpose of the present study and that a simpler yet adequate model might be devised.