The Theory of Ocular Defects And of Spectacles
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In our eReader you can find the full English version of the book. Read The Theory of Ocular Defects And of Spectacles 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 Theory of Ocular Defects And of Spectacles
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To quickly assess the difficulty of the text, read a short excerpt:
In the construction and fitting of spectacle frames this requirement should be remembered.
It is manifest that the convexity or the concavity of the lens is no general or essential means of aid as against the short, the far, or the over-sightedness, since these defects do not depend unconditionally upon a simple anomaly of refraction, but, as a rule, upon a combination of an anomaly of refraction with an anomaly of accommodation ; combinations which may, as we have seen, be of various kinds.
It... is also clear, since spherical lenses and external aids gene- rally act by changing only the refraction, and not the accom- modation, that as a rule a short-sighted, or a far-sighted, or an over-sighted eye cannot be rendered normal, or changed into one that is at once emmetropic and europic. When we arrive at the question how to improve the vision of an abnormal eye for actual use, we shall find that this can only be done within cer- tain limits of distance, and in a degree more or less complete.
What to read after The Theory of Ocular Defects And of Spectacles?
You can find similar books in the "Read Also" column, or choose other free books by Hermann Scheffler to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
In the construction and fitting of spectacle frames this requirement should be remembered.
It is manifest that the convexity or the concavity of the lens is no general or essential means of aid as against the short, the far, or the over-sightedness, since these defects do not depend unconditionally upon a simple anomaly of refraction, but, as a rule, upon a combination of an anomaly of refraction with an anomaly of accommodation ; combinations which may, as we have seen, be of various kinds.
It... is also clear, since spherical lenses and external aids gene- rally act by changing only the refraction, and not the accom- modation, that as a rule a short-sighted, or a far-sighted, or an over-sighted eye cannot be rendered normal, or changed into one that is at once emmetropic and europic. When we arrive at the question how to improve the vision of an abnormal eye for actual use, we shall find that this can only be done within cer- tain limits of distance, and in a degree more or less complete.
What to read after The Theory of Ocular Defects And of Spectacles?
You can find similar books in the "Read Also" column, or choose other free books by Hermann Scheffler to read onlineMoreLess
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