This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ...they should not be advised to wear them. The theory of the conversion of a moderately hyperopic eye, with good vision for the distance without glasses, into an emmetropic one with a view to diminishing asthenopia or relieving headaches, is an illusory one. I have had great satisfaction in relieving patients who had ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ...they should not be advised to wear them. The theory of the conversion of a moderately hyperopic eye, with good vision for the distance without glasses, into an emmetropic one with a view to diminishing asthenopia or relieving headaches, is an illusory one. I have had great satisfaction in relieving patients who had-without glasses, but who were advised to wear them all the time, from a real thraldom, and I have found that their asthenopic symptoms were relieved just as effectually when they wore these glasses for near work only. It is only exceptionally that such persons should be required to wear glasses constantly, and then they will be agreeable to them. The emmetropic eye is an ideal eye. The one that is moderately hyperopic is the one which has been generally given the human race--to the civilized certainly, and probably to the barbarous also. 3. Facultative or voluntary hypermetropia.--There is a class of patients who see at a distance equally well with or without convex glasses. They will see with no glass or with a convex 1507, Locust Street. FACULTATIVE HYPERMETROPIA 91 one. Such persons are hypermetropic, for no emmetrope can wear even very weak (0.25 D) convex glasses without being conscious of some Fig. 10.--Refractive Error + 0.50 D. G. J. Bull This plate represents an error equal to + 0.50 D. The blurring is marked, while the smaller letters have almost completely faded away. In the so-called " clock dial test" there is a stellar appearance around the centre.1 blurring of the vision, when he looks at the testtypes placed twenty feet away. This variety of hypermetropia may, like the latent and manifest, 1 Transactions of the Ophthalmological Society of the United Kingdom, 1896. cause asthenopia. It is not, however, usually necessary t...
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Seller's Description:
Good. Book Late 19th century, illustrated, 193 page page work on the correction of eyesight issues with glasses. Light rub marks, binding is a bit cocked.