Does anyone know of a simple eye simulator? (geometrical optics)

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A user is seeking a simple calculator, preferably matrix-based, to determine the size of an image projected on the retina from an object at a specific distance. They mention that traditional thin film approximations are inadequate for this purpose. The user provides an example involving an object 3 cm from the eye that is 5 mm across, asking for the maximum extent of the image on the retina. They reference the Gullstrand model as a standard eye model relevant to their query. The discussion emphasizes the need for tools that can accurately calculate image projection in geometrical optics.
Jet Black
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I'm looking for a "simple" calculator, most likely a matrix based thing, to allow me to work out the size of an image projected on the retina by an object of a given size some distance from the retina. being the eye, the thin film approximation is no good (i.e. if I have an object 3cm from the eye that is 5mm across, what is the extent of that object on the retina - yes I know it will be out of focus, but the maximum extent is fine)... anyone know of such thing anywhere?
 
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There's a few models of the eye, one of the basic/standard ones is the "Gullstrand model"

http://www.visualopticslab.com/opti535/lectures/class02_08.pdf
 
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