CHAPTER XVII. Symptoms of Heterophoria 128

SYMPTOMS OF HETEROPHORIA 128 Treatment 130 Destrophoria and Laevophoria 132

The demands of the day for maximum efficiency in the refracting world are largely accountable for the inception, continuous improvement and ultimate development of the master model Ski-optometer.

The present volume, dealing with the instrument’s distinctive operative features, has been prepared not only for Ski-optometer users, but also for those interested in the simplification of refraction and muscular imbalance.

The author is indebted for invaluable counsel, to

Louis J. Ameno, M.D., New York. E. LeRoy Ryer, O.D., New York. Jos. D. Heitger, M.D., Louisville, Ky. W. B. Needles, N.D., Kansas City, Mo.

INTRODUCTORY

While in a measure the conventional trial-case still serves its purpose, so much of the refractionist’s time is consumed through the mechanical process of individually transferring the trial-case spheres and cylinder lenses, that far too little thought is given to muscular imbalance, notwithstanding its importance in all refraction cases.

Dr. Samuel Theibold, of Johns Hopkins University, in a recent address before the American Medical Association, stated that the average refractionist was inclined to devote an excess of time to general refraction, completely overlooking the important test and correction of muscular imbalance. If the latter is to be at all considered, general refraction must be simplified—without impairing its accuracy—a result that is greatly facilitated through the use of the Ski-optometer.

One must admit that tediously selecting the required trial-case lens—whether sphere, cylinder or prism—watching the stamped number on the handle—continual wiping and inserting each individual lens in a trial-frame is a time-consuming practise. This is readily overcome, however, through the employment of the Ski-optometer.

In a word, the Ski-optometer is practically an automatic trial-case, bearing the same relation to the refracting room as the accepted labor and time-saving devices of the day bear to the commercial world.

The present volume has accordingly been published, not alone in the interest of those possessing a Ski-optometer, but also for those interested in attaining the highest point of efficiency in the work of refraction and muscular imbalance.

Ski-optometer Lens Battery (almost actual size) showing how sphere and cylinder lenses are procured.

After obtaining FINAL results, your prescription is automatically registered, ALL READY for you to transcribe.

Fig. 1—The three time-saving moves necessary in the operation of the Ski-optometer.]