Glass eye

Definition and stakes

Arabella B. Buckley,  Through Magic Glasses and Other Lectures

“ C, D, Magnifying-glass. A, B, Enlarged image of the arrow.
"It is here that our 'magic glasses' come to our assistance, and reveal to us what was before invisible. We learnt just now that we see near things by the lens of our eye becoming more rounded in front; but [Pg 36] there comes a point beyond which the lens cannot bulge any more, so that when a thing is very tiny, and would have to be held very close to the eye for us to see it, the lens can no longer collect the rays to a focus, so we see nothing but a blur.
”
Source: Gutenberg

Henry Coddington,  An Elementary Treatise on Optics (1823)

“ It is evident then, that if the eye glass be a powerful lens, which it always is in practice, the final image subtends a much larger angle at the eye which is placed close to the eye glass, than the object does, and it is brighter, for the eye receives in the one case all the light which falls on the object glass, in the other, only as much of that coming from the object as can pass through the pupil of the eye. ”
Source: Wikisource

Portrait of H. Rider Haggard H. Rider Haggard,  King Solomon's Mines

“ He was so very neat and so very clean-shaved, and he always wore an eye-glass in his right eye. It seemed to grow there, for it had no string, and he never took it out except to wipe it. At first I thought he used to sleep in it, but afterwards I found that this was a mistake. He put it in his trousers pocket when he went to bed, together with his false teeth, of which he had two beautiful sets that, my own being none of the best, have often caused me to break the tenth commandment. ”
Source: Gutenberg

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