Lectures On the Errors of Refraction And Their Correction With Glasses
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In our eReader you can find the full English version of the book. Read Lectures On the Errors of Refraction And Their Correction With Glasses 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 Lectures On the Errors of Refraction And Their Correction With Glasses
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They will there form circles of diffusion, and the images on the retina will be indistinct. Then those rays passing from the retina, coming from a point farther removed from the refractive surfaces, but having the sawc refractive angle, will pass out of the eye in a convergent direction.
I would therefore class the myopic eye as one whose optic axis is longer than that of the normal eye, or one in which parallel rays will focus in front of the retina, and the emergent rays are always convergent....
You will find that this condition exists in nearly all cases of myopia. But there are other conditions that 68 MYOPIA. 69 may cause it. The refractive power of the dioptric ap- paratus may be too strong, due to an increase in the normal curvature of the cornea or lens. The eyeball may be of the normal length, but owing to the increase in the refractive power the rays will focus in front of the retina.
Another remote cause you will sometimes see in the first stages of cataract, as a person will then become myopic or shortsighted, though the eyes had always hitherto been normal for distant vision.
What to read after Lectures On the Errors of Refraction And Their Correction With Glasses?
You can find similar books in the "Read Also" column, or choose other free books by Francis Valk to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
They will there form circles of diffusion, and the images on the retina will be indistinct. Then those rays passing from the retina, coming from a point farther removed from the refractive surfaces, but having the sawc refractive angle, will pass out of the eye in a convergent direction.
I would therefore class the myopic eye as one whose optic axis is longer than that of the normal eye, or one in which parallel rays will focus in front of the retina, and the emergent rays are always convergent....
You will find that this condition exists in nearly all cases of myopia. But there are other conditions that 68 MYOPIA. 69 may cause it. The refractive power of the dioptric ap- paratus may be too strong, due to an increase in the normal curvature of the cornea or lens. The eyeball may be of the normal length, but owing to the increase in the refractive power the rays will focus in front of the retina.
Another remote cause you will sometimes see in the first stages of cataract, as a person will then become myopic or shortsighted, though the eyes had always hitherto been normal for distant vision.
What to read after Lectures On the Errors of Refraction And Their Correction With Glasses?
You can find similar books in the "Read Also" column, or choose other free books by Francis Valk to read onlineMoreLess
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