. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. ned, the first rule of making the test foroptical correction with the Ski-optometersspherical and cylindrical lenses, would be inthe line of routine. The binocular test madewith the phorometer and combined use of thered Maddox rod would have determined thesix degrees of esophoria. [70] Refraction and Muscular Imbalance The reason for making the binocular muscletest before and after the optical correction isbecause an imbalance is often aggravated orbenefited by the correcting lenses. Theoptical correction
. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. ned, the first rule of making the test foroptical correction with the Ski-optometersspherical and cylindrical lenses, would be inthe line of routine. The binocular test madewith the phorometer and combined use of thered Maddox rod would have determined thesix degrees of esophoria. [70] Refraction and Muscular Imbalance The reason for making the binocular muscletest before and after the optical correction isbecause an imbalance is often aggravated orbenefited by the correcting lenses. Theoptical correction frequently eliminates theneed for further muscular treatment. For example, we will assume that theoptical correction tends to decrease the degreeof esophoria from six degrees to four to the previously mentioned rulefor correcting cases exceeding one degree inhyperphoria, three degrees in exophoria andfive degrees in esophoria, the condition wouldindicate that of being left alone. Just whatis taking place should be fully understood—its cause as well as its Perfectly centered Lpupil Centered pupil anddecentered lens Centered lens and decenteredpupil Fig. 25—Comparative diagram showing how a decentered lens before a centered eye has the same effect as a centered lens before a decentered eye. When not otherwise specified, accuratelycentered lenses are of primary pupil of the eye should be directly be-hind the center of each lens (Fig. 25). [71] Refraction and Muscular Imbalance Figure A of the latter sketch illustratesa perfectly centered lens—its center indicatedby a cross, the circle representing an eye di-rectly behind it. Figure B illustrates a per-fectly centered pupil behind a prism, with itscenter designated by a cross. To ascertainhow the centered spherical lens takes the placeof a prism. Figure C should be comparedwith Figure B; this will show that the eyeis decentered, while the lens is centered. Afurther comparison will pr
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