If the processor is a human eye, objects laying over a large field can be correctly imaged for distances varying from infinity topunctumproximum (25 cm). The optics standard parameters of the human eye generally assume that the low gradient index of the lens may be approximated by a constant index. Le Grand [70] proposed nd = 1.44 or 1.45 for this index; we have found that raytraces are more realistic with nd = 1.45 for the lens (Table 1.7).

Table 1.7 Optical parameters of the standard human eye working at infinity or at punctum proximum (after Le Grand [70]) and with some complements from raytrace by the author) (Lengths in [mm])


Radius of Curv.

Axial Separat.


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