. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. Ski-optometer Master Model 215 Embodying in a Single Instrument, in Convenient Form,Cylindrical and Spherical Lenses, in Combinationwith Appliances for Testing and Cor-recting Miiscvdar Imbalance. Refraction andMuscular Imbalance As Simplified Through the Use of the Ski-optometer ByDANIEL WOOLF / WOOLF INSTRUMENT CORPORATION New York: 516 Fifth Avenue r iCxvjJCC^ jL^/YtX^^ iERiCELSY \ UhkARY UNfVc«JlTY OfCALIfORNiA OPTOMETRY LIBRARY Copyright 1921By WOOLF INSTRUMENT CORPORATION Published by Theodore S. Hol
. Refraction and muscular imbalance, as simplified through the use of the ski-optometer. Ski-optometer Master Model 215 Embodying in a Single Instrument, in Convenient Form,Cylindrical and Spherical Lenses, in Combinationwith Appliances for Testing and Cor-recting Miiscvdar Imbalance. Refraction andMuscular Imbalance As Simplified Through the Use of the Ski-optometer ByDANIEL WOOLF / WOOLF INSTRUMENT CORPORATION New York: 516 Fifth Avenue r iCxvjJCC^ jL^/YtX^^ iERiCELSY \ UhkARY UNfVc«JlTY OfCALIfORNiA OPTOMETRY LIBRARY Copyright 1921By WOOLF INSTRUMENT CORPORATION Published by Theodore S. Holbrook New York CONTENTS Chapter I Page SkI-OPTOMETER CoNSTRUCTrON 1 Convex Spherical 2 Operates and Indicates Automatically 6 Concave Spherical Lenses 7 Chapter II Cylindrical Lenses 10 Obtaining Correct Focus 11 Why Concave Cylinders Are Used Exclusively 14 Transposition of Lenses >.• 14 Chapter III How THE Ski-optometer Assists in Refraction 17 The Use of the Ski-optometer in Skioscopy 17 A Simplified Skioscopic Method 20 Employing Spheres and Cylinders in Skioscopyrefractionmuscul00woolrich
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