...By variationsin the size of this aperture the amount of light transmitted to the retina isregulated... 
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...This is a paralysis of the nerve of sight or the expansion of the retina...
U.S. Department of Agriculture 「Special Report on Diseases of Cattle」
...Ocellus: a simple eye, consisting of a single convex orbead-like lens, which conveys an image to a retina...
John. B. Smith 「Explanation of Terms Used in Entomology」
...Retinula -ae: the retina of a single ocellus: the nervefibres or cells between pigment cells and retina of the compoundeye...
John. B. Smith 「Explanation of Terms Used in Entomology」
...This form of drawing isbased on the consideration of the flat appearances on the retina,with the knowledge of the felt shapes of objects for the time beingforgotten...
Harold Speed 「The Practice and Science Of Drawing」
...This was a precaution that occurred to me, as there was a possibility that the vertical diameter of the retina might be more or less sensitive than the horizontal one...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...Ifyou can not see them at first, turn your eye toward oneside of the field of view, and thus, by bringing their imagesupon a more sensitive part of the retina, you may glimpsethem...
Garrett Serviss 「Pleasures of the telescope」
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