A Treatise On the Motor Apparatus of the Eyes Embracing An Exposition of the An
A Treatise On the Motor Apparatus of the Eyes Embracing An Exposition of the An
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The two classes are therefore, in general, different degrees of similar affections, the classification depending upon the psychical presence or absence of the phenomenon of fusion of images. Under certain circumstances the conditions of one of these groups may pass into the other. One who in robust health blends images habitually and without conscious difficulty, may, in a condition of impaired nervous energy, be quite unable to maintain a fusion of the images of the two eyes.
Even the presence... of or the absence of binocular vision, then, does not constitute an absolute and sharply denned line of classifica- tion.
It happens also that, with gross departure from the standard of equilibrium of the eye muscles, habitual binocular vision is some- times maintained. It depends largely upon the combinations of anomalous conditions. One might, in case of a tendency of the eyes to deviate in, for example, under circumstances of moderate leaning of the meridians, maintain the fusion of the images, but should this be accompanied by a tilting of the vertical meridian of a more con- siderable extent, the fusion might no longer be possible.
What to read after A Treatise On the Motor Apparatus of the Eyes Embracing An Exposition of the An?
You can find similar books in the "Read Also" column, or choose other free books by George T George Thomas Stevens to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The two classes are therefore, in general, different degrees of similar affections, the classification depending upon the psychical presence or absence of the phenomenon of fusion of images. Under certain circumstances the conditions of one of these groups may pass into the other. One who in robust health blends images habitually and without conscious difficulty, may, in a condition of impaired nervous energy, be quite unable to maintain a fusion of the images of the two eyes.
Even the presence... of or the absence of binocular vision, then, does not constitute an absolute and sharply denned line of classifica- tion.
It happens also that, with gross departure from the standard of equilibrium of the eye muscles, habitual binocular vision is some- times maintained. It depends largely upon the combinations of anomalous conditions. One might, in case of a tendency of the eyes to deviate in, for example, under circumstances of moderate leaning of the meridians, maintain the fusion of the images, but should this be accompanied by a tilting of the vertical meridian of a more con- siderable extent, the fusion might no longer be possible.
What to read after A Treatise On the Motor Apparatus of the Eyes Embracing An Exposition of the An?
You can find similar books in the "Read Also" column, or choose other free books by George T George Thomas Stevens to read onlineMoreLess
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