...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」
...Immediately under the sclerotic we find a very delicate, dark-red membrane,very rich in blood-vessels—the choroid coat—and inside thisthe retina (o), the expansion of the optic nerve (i)...
Ernst Haeckel 「The Evolution of Man」
..."See Naples, and die," is the cuckoocry of the modern tourist who visits this enchanted region; and such avision is indeed worthy to be the last imprinted upon a human retina...
Hugh Macmillan 「Roman Mosaics」
...One would suppose it to be an annular eclipse,with the difference that this can be observed with the naked eye,without fatigue to the retina, and drawn quietly...
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...By using a concave glass instead of a convex,and placing it so as to prevent any image being formed, except onthe retina direct, this inconvenience is avoided...
Oliver Lodge 「Pioneers of Science」
...The illuminationof the image on the retina is thus effectively controlled in accordancewith the requirements of vision...
Robert Stawell Ball 「The Story of the Heavens」
...Greatas may be the delicacy of the retina, it is not adequate to theperception of form in a picture so minute...
Robert Stawell Ball 「The Story of the Heavens」
...The light of fainter stars than these does not affect the retina enough for them to be seen...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...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」
... if there was not a progressive motion of light from these stars to the retina of our eye? ...
Paul Henri Thiery (Baron D'Holbach) 「The System of Nature, Volume 1」
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