. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. that it is the weakest lens that will causeits neutralization. Practically but few lenseshave been used to obtain the final result prov-ing the instruments importance and time-sav-ing value in skioscopy, and demonstrating thesimplicity with which tedious transference oftrial-case lenses is avoided. Furthermore, it should be noted that wherethe Ski-optometer is used in skioscopy, it isnot necessary to remove the retinoscope fromthe eye or to constantly locate a new reflexwith each lens change. This permits
. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. that it is the weakest lens that will causeits neutralization. Practically but few lenseshave been used to obtain the final result prov-ing the instruments importance and time-sav-ing value in skioscopy, and demonstrating thesimplicity with which tedious transference oftrial-case lenses is avoided. Furthermore, it should be noted that wherethe Ski-optometer is used in skioscopy, it isnot necessary to remove the retinoscope fromthe eye or to constantly locate a new reflexwith each lens change. This permits a directcomparison of the final lens and eliminates theusual difficulty in mastering skioscopy. Thechief cause of this difficulty is due to the fact [18] Refraction and Muscular Imbalance that the transferring of the trial-case lensesmakes it practically impossible for the studentto determine whether the previous lens causedmore Svith or against motion. Where the indirect method is employed inskioscopy, best results are secured through theuse of the Woolf ophthalmic bracket and con-. Fig. 9—The Woolf ophthalmic bracket. A convenient and portable accessory in skioscopy and muscle testing; can be used with or without Greek cross. centrated filament lamp,together with an irisdiaphragm chimney. The latter permits thereduction or increase of the amount of lightentering the eye, as it is agreed that a largepupil requires less light, a small pupil re-quiring more light. The bracket referred topermits the operator to swing the light intoany desired position (Fig. 9), while theiris diaphragm chimney serves as a apparatus may also be employed for [19] Refraction and Muscular Imbalance muscle testing, as described in a subsequentparagraph. A Simplified Skioscopic MethodIn using the Ski-optometer, instead ofworking forty inches away from the patientin skioscopy and deducting , the refrac-tionist will find it more convenient to work ata twenty-inch distance, deducting
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