The Human Mechanism
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In our eReader you can find the full English version of the book. Read The Human Mechanism Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Human Mechanism
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Moreover, to see SENSE ORGANS AND SENSATIONS 249 near objects the ciliary muscle must work much harder than in the normal eye, and it often happens that, even with its utmost effort, the rays are not sufficiently bent to focus them on the retina ; so that a book, for example, must be held at arm's length to be read. Persons having such eyes form one class of those said to be " far-sighted, " and their trouble can be corrected by the use of convex glasses.
As old age ap- proaches, changes oc- cu...r in the lens ; in consequence, it no longer becomes as convex as formerly in response to the ac- tion of the muscle of accommodation (^presbyopia, from 9r/wkv8i/9, " old "). Some, though not all, results of this condition resemble those of hyperme- -. FIG. 98. A test for astigmatism tropia; but the two differ in cause. Hypermetropia is due to shortness of eyeball ; presbyopia, to failure of accommodation.
11. Astigmatism. We have thus far been dealing with those optical imperfections due to improper distance between the lens and the retina.
What to read after The Human Mechanism?
You can find similar books in the "Read Also" column, or choose other free books by Theodore Hough to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Moreover, to see SENSE ORGANS AND SENSATIONS 249 near objects the ciliary muscle must work much harder than in the normal eye, and it often happens that, even with its utmost effort, the rays are not sufficiently bent to focus them on the retina ; so that a book, for example, must be held at arm's length to be read. Persons having such eyes form one class of those said to be " far-sighted, " and their trouble can be corrected by the use of convex glasses.
As old age ap- proaches, changes oc- cu...r in the lens ; in consequence, it no longer becomes as convex as formerly in response to the ac- tion of the muscle of accommodation (^presbyopia, from 9r/wkv8i/9, " old "). Some, though not all, results of this condition resemble those of hyperme- -. FIG. 98. A test for astigmatism tropia; but the two differ in cause. Hypermetropia is due to shortness of eyeball ; presbyopia, to failure of accommodation.
11. Astigmatism. We have thus far been dealing with those optical imperfections due to improper distance between the lens and the retina.
What to read after The Human Mechanism?
You can find similar books in the "Read Also" column, or choose other free books by Theodore Hough to read onlineMoreLess
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