The Refraction of the Eye: a Manual for Students
The Refraction of the Eye: a Manual for Students
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In our eReader you can find the full English version of the book. Read The Refraction of the Eye: a Manual for Students 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 Refraction of the Eye: a Manual for Students
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, then the patient can never require a glass for presbyopia, his far point being at 30 cm. His near point may recede to this distance when all accommodation is lost, but he will still be able to read at that distance, though at that distance only.
Many people with a low degree of astigmatism have no discomfort and see fairly well, therefore they never wear a correction ; when glasses become neces- sary for near work such persons may prefer a simple sphere rather than a sphere to which has been ...added their astigmatic correction. Each case must be treated on its merits.
But it must be borne in mind that as age advances the refraction of the eye diminishes ; in other words, the eye if emmetropic becomes hypermetropic (called acquired hypermetropia). The myopic eye becomes less myopic, so that a real improvement in vision takes place. The hypermetropic eye becomes more hypermetropic. This change takes place at a regular rate in all eyes ; at fif tj^-five the refraction has diminished "25 D.
What to read after The Refraction of the Eye: a Manual for Students?
You can find similar books in the "Read Also" column, or choose other free books by Gustavus Hartridge to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
, then the patient can never require a glass for presbyopia, his far point being at 30 cm. His near point may recede to this distance when all accommodation is lost, but he will still be able to read at that distance, though at that distance only.
Many people with a low degree of astigmatism have no discomfort and see fairly well, therefore they never wear a correction ; when glasses become neces- sary for near work such persons may prefer a simple sphere rather than a sphere to which has been ...added their astigmatic correction. Each case must be treated on its merits.
But it must be borne in mind that as age advances the refraction of the eye diminishes ; in other words, the eye if emmetropic becomes hypermetropic (called acquired hypermetropia). The myopic eye becomes less myopic, so that a real improvement in vision takes place. The hypermetropic eye becomes more hypermetropic. This change takes place at a regular rate in all eyes ; at fif tj^-five the refraction has diminished "25 D.
What to read after The Refraction of the Eye: a Manual for Students?
You can find similar books in the "Read Also" column, or choose other free books by Gustavus Hartridge to read onlineMoreLess
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