Time Required for a Cure 103
ordinarily so acute that she could see the moons of Jupi ter with the naked eye became myopic when asked to do a sum in mental arithmetic, mathematics being a sub ject which was extremely distasteful to her. Sometimes the conditions which produce mental relaxation are very curious. One patient, for instance, was able to correct her error of refraction when she looked at the test card with her body bent over at an angle of about forty-five degrees, and the relaxation continued after she had as sumed the upright position. Although the position was an unfavorable one, she had somehow got the idea that it improved her sight, and therefore it did so.
The time required to effect a permanent cure varies greatly with different individuals. In some cases five, ten, or fifteen minutes is sufficient, and I believe the time is coming when it will be possible to cure everyone quickly. It is only a question of accumulating more facts, and presenting these facts in such a way that the patient can grasp them quickly. At present, however, it is often necessary to continue the treatment for weeks and months, although the error of refraction may be no greater nor of longer-duration than in those cases that are cured quickly. In most cases, too, the treatment must be continued for a few minutes every day to pre vent relapse. Because a familiar object tends to relax the strain to see, the daily reading of the Snellen test card is usually sufficient for this purpose. It is also use ful, particularly when the vision at the near point "is imperfect, to read fine print every day as close to the eyes as it can be done. When a cure is complete it is always permanent; but complete cures, which mean the attainment, not of what is ordinarily called normal sight, but of a measure of telescopic and microscopic vision,