Refraction and muscular imbalance, as simplified through the use of the ski-optometer
CHAPTER I Page
SKI-OPTOMETER CONSTRUCTION 1 Convex Spherical Lenses 2 Operates and Indicates Automatically 6 Concave Spherical Lenses 7
Refraction and muscular imbalance, as simplified through the use of the ski-optometer
SKI-OPTOMETER CONSTRUCTION 1 Convex Spherical Lenses 2 Operates and Indicates Automatically 6 Concave Spherical Lenses 7