. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. hat is greatly facilitated through theuse of the Ski-optometer. One must admit that tediously selecting therequired trial-case lens—whether sphere, cyl-inder or prism—watching the stamped num-ber on the handle—continual wiping and in-serting each individual lens in a trial frameis a time-consuming practise. This is readilyovercome, however, through the employmentof the Ski-optometer. INTRODUCTORY In a word, the Ski-optomctcr is practicallyan automatic trial case, bearing the same rela-tion to the refractin
. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. hat is greatly facilitated through theuse of the Ski-optometer. One must admit that tediously selecting therequired trial-case lens—whether sphere, cyl-inder or prism—watching the stamped num-ber on the handle—continual wiping and in-serting each individual lens in a trial frameis a time-consuming practise. This is readilyovercome, however, through the employmentof the Ski-optometer. INTRODUCTORY In a word, the Ski-optomctcr is practicallyan automatic trial case, bearing the same rela-tion to the refracting room as the acceptedlabor and time-saving devices of the day bearto the commercial world. The present volume has accordingly beenpublished, not alone in the interest of thosepossessing a Ski-optometer, but also for thoseinterested in attaining the highest point of ef-ficiency in the work of refraction and muscu-lar imbalance. Ski-cptorneter Lens Battery[ahnost actual i/zf] shoiv-ing hoiv sphere and cyl-inder lenses are procured. Supple in e n t a r y DiskHandle and CylindersRegister Here 1st—Turn this Single Reel to obtain all yourspherical lenses, whether convex or concave. 2nd—Set this axis indicator, which automat-ically positions each cylinder lens at the axisdesignated. 3rd—Then merely turn this Single Reel toobtain your various cylinder lens strengths atthat axis. After obtainingFINAL results,your prescription isautomatically re-gistered, ALLREADY for youto transcribe. Fig. 1—The three time-saving moves necessary in theoperation of the Ski-optometer. Chapter ISKI-OPTOMETER CONSTRUCTION A FAR better understanding of the instru-ment will be secured if the refractionistpossessing a Ski-optometer will place it beforehim, working out each operation and experi-ment step by step in its proper routine. The three moves as outlined in Fig. 1 shouldfirst be thoughtfully studied and the method ofobtaining the spheres and cylinders carefullyobserved.
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Keywords: ., bookcentury1900, bookdecade1920, bookidrefractionmu, bookyear1921
