. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, perphoria. Or if the right eye fixes an object and. OM Fig. 153. MUSCLES. 175 the left eye sees a false object below, then the position ofthe left e)-e is spoken of as left hyperphoria. Unfortunatel),in hyperphoria (unless from paralysis) the position of theeyes does not tell whether the right superior rectus is toostrong and the left inferior rectus too weak, or the left supe-rior rectus too weak and the right inferior rectus too strong. Muscle Phorometry.—Testing the
. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, perphoria. Or if the right eye fixes an object and. OM Fig. 153. MUSCLES. 175 the left eye sees a false object below, then the position ofthe left e)-e is spoken of as left hyperphoria. Unfortunatel),in hyperphoria (unless from paralysis) the position of theeyes does not tell whether the right superior rectus is toostrong and the left inferior rectus too weak, or the left supe-rior rectus too weak and the right inferior rectus too strong. Muscle Phorometry.—Testing the power of the ocularmuscles. Abduction.—The power of the external recti muscles toturn the eyes outward. The patient is comfortably seatedand told to look at a point of steady light at a distance ofabout 6 meters, slightly below the level of his e}-es, neverabove the level. In this position prisms with their bases in-ward are placed in front of one or both eyes until thepatient says he sees two lights very close together. Thestrength of the prism or prisms thus placed before theeyes wdiich will just permit the eyes to see one objectand if increased w^ould produce dipl
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Keywords: ., bookcentury1900, bookdecade1900, bookidref, booksubjecteyeglasses
