. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. sphereIndu /itor Fig. 3—To obtain sphericals, turn this Single Reel as shown by dotted finger. This assures an automatic and simultaneous registration at sphere indicator of focus of lens appearing at sight opening. Convex Spherical Lenses A careful study will show that the Ski-optomoters spherical lenses are obtained bymerely turning the smaller reel (Fig. 3).The first outward turn of this reel, toward thetemporal side of the instrument, draws intoposition in rcguhir order the spherical lenses [2] Refract

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. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. sphereIndu /itor Fig. 3—To obtain sphericals, turn this Single Reel as shown by dotted finger. This assures an automatic and simultaneous registration at sphere indicator of focus of lens appearing at sight opening. Convex Spherical Lenses A careful study will show that the Ski-optomoters spherical lenses are obtained bymerely turning the smaller reel (Fig. 3).The first outward turn of this reel, toward thetemporal side of the instrument, draws intoposition in rcguhir order the spherical lenses [2] Refraction and Muscular Imbalance , +.50, +.75, and +, as shown inFig. 3-A — Outer spherical reel containing Cx. sphericals from .025 to and a blank.

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Keywords: ., bookcentury1900, bookdecade1920, bookidrefractionmu, bookyear1921