VISION. 173 In the figure the dotted lines indicate the path of the raysfrom the lamp, to the centre of the lens A. These illuminatethe central portion of the retina. Other rays not shewn fallon other parts of the lens and reach other portions of theretina. Fig. 121 shews the path of the rays when… … Fig. 121. and therefore illuminate it diffusely. If the eye be normal,the diffused light from each point of the retina emerges as aparallel pencil, and an eye looking through 0, the apertureof the mirror M, sees a magnified and erect image of theretina. If the patients eye be short-sighted the…
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