The Cure of Imperfect Sight by Treatment
Without Glasses - online book

The Original Bates Method, for correcting vision defects

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T HE power of the eye to change its focus for vision at different distances has puzzled the scientific mind ever since Kepler1 tried to ex plain it by supposing a change in the position of the crystalline lens. Later on every imaginable hypothesis was advanced to account for it. The idea of Kepler had many supporters. So also had the idea that the change of focus was effected by a lengthening of the eyeball. Some believed that the contractive power of the pupil was sufficient to account for the phenomenon, until the fact was established, by the operation for the removal of the iris, that the eye accommodated perfectly without this part of the visual mechanism. Some, dissatisfied with all these theories, discarded them all, and boldly asserted that no change of focus took place,2 a view which was conclusively disproven when the invention of the ophthalmoscope made it possible to see the interior of the eye.
The idea that the change of focus might be brought about by a change in the form of the lens appears to have been first advanced, according to Landolt,3 by the
1 Johannes Kepler (1571-1630). German theologian, astronomer and phys icist. Many facts of physiological optics were either discovered, or first clearly stated, by him.
2 Donders: On the Anomalies of Accommodation and Refraction of the Eye. English translation by Moore, 1864, p. 10. Frans Cornelis Donders (1818-1889) was professor of physiology and ophthalmology at the University of Utrecht, and is ranked as one of the greatest ophthalmologists of all time.
8 Edmund Landolt (1846-) Swiss ophthalmologist who settled in Paris in 1874, founding an eye clinic which has attracted many students.