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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?