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90 Cause and Cure of Errors of Refraction |
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Patient reading fine print in a good light at thirteen inches, the object of vision being placed above the eye so as to be out of the line of the camera. Simultaneous retino-scopy indicated that the eye was focused at thirteen inches. The glass was used with the retinoscope to de termine the amount of the refraction. |
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Fig. 34. Straining to See at the Near-Point Produces Hypermetropia |
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When the room was darkened the patient failed to read the fine print at thirteen inches and the retino scope indicated that the eye was focused at a greater distance. When a conscious strain of considerable degree was made to see, the eye became hypermetropic. |
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