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

The Original Bates Method, for correcting vision defects

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46 Accommodation: Experiments on Animals
with myopic or hypermetropic refraction. It was also produced by various manipulations of both the oblique and recti muscles. Mixed astigmatism, which is a com bination of myopic with hypermetropic refraction, was
Fig. 18. Demonstration Upon the Eyeball of a Rabbit That the Obliques Lengthen the Visual Axis in Myopia
R, rest. The eyeball is of normal length and emmetropic-that is, perfectly adjusted for distant vision. My, myopia. The pull of the oblique muscles has been strengthened by advancement, and the retinoscope shows that myopia has been produced. It can easily be noted that the eyeball is longer. It was impossible to avoid some movement of the head between the taking of the two pictures as a result of the manipulation of the strings, but the rule shows that the focus of the camera was not appreciably changed by such movements.
always produced by traction on the insertion of the supe rior or inferior rectus in a direction parallel to the plane of the iris, so long as both obliques were present and active: but if either or both of the obliques had been cut,