Refraction and muscular imbalance, as simplified through the use of the ski-optometer
CHAPTER IV
IMPORTANT POINTS IN CONNECTION WITH THE USE OF THE SKI-OPTOMETER 30 Elimination of Trial-Frame Discomfort 30 Rigidity of Construction 31 How to Place the Ski-optometer in Position 32 Cleaning the Lenses 33 Accuracy Assured in Every Test 34 Built to Last a Lifetime 35