The Ocular Muscles a Practical Handbook On the Muscular Anomalies of the Eye

Cover The Ocular Muscles a Practical Handbook On the Muscular Anomalies of the Eye
The Ocular Muscles a Practical Handbook On the Muscular Anomalies of the Eye
Howard Forde Hansell
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Thus right hyperphoria of 2 degrees would in- dicate that right supra-duction was stronger by that amount than right infra-duction.
If the prism which is placed before the eye is not too strong to overcome the power of fusion (in other w^ords, to destroy bin- ocular vision) the eye before which it is placed will be so rotated that the fovea will be moved from its original position to that occupied by the image. This faculty of setting aside by rota- tion the transient diplopia thus in- duced is
... known as the ability to overcome prisms, or the prism rota- tion, or the deviation power of the muscles. The student must not con- fuse prism rotation in the sense just mentioned wdth the arc rotations of the eye; for instance, the abductors will normally overcome but 8 to 10 degrees of prism base-in at 6 meters (external prism-rotation, abduction, or prism divergence) whereas the eye can be rotated or the gaze directed 45 to 50 degrees from the primary position (arc rotation or version).
When the prism is first interposed the right eye sees the image at A^ (Fig.


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