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

The Original Bates Method, for correcting vision defects

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Production of Astigmatism               45
beings or animals, but in all of my experiments it was found that when used in this way it had very little effect upon the power of the eye to change its focus.
Astigmatism was usually produced in combination
Fig. 17.
No. 1.-Production of mixed astigmatism in the eye of a carp by pulling strings attached to the conjunctiva in opposite direc tions. Note the oval shape of the front of the eyeball.
No. 2.-With the cutting of the strings the eyeball returns to its normal shape, and the refraction becomes normal.