Refraction and muscular imbalance, as simplified through the use of the ski-optometer
CHAPTER II
CYLINDRICAL LENSES 10 Obtaining Correct Focus 11 Why Concave Cylinders Are Used Exclusively 14 Transposition of Lenses 14
Refraction and muscular imbalance, as simplified through the use of the ski-optometer
CYLINDRICAL LENSES 10 Obtaining Correct Focus 11 Why Concave Cylinders Are Used Exclusively 14 Transposition of Lenses 14