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42 Accommodation: Experiments on Animals |
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duced by any manipulation of the obliques whereby their pull was increased. This was done by a tucking opera tion of one or both muscles, or by an advancement of the |
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Fig. 15. Demonstration Upon the Eye of a Rabbit That the Production of the Refractive Errors Is Dependent Upon the Action of the External Muscles. The String Is Fastened to the Insertion of the Superior Oblique and Rectus Muscles |
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No. 1.-Backward pull. Myopia is produced.
No. 2.-Forward pull. Hypermetropia is pro duced.
No. 3.-Upward pull in the plane of the iris. Mixed astigmatism is pro duced.
point at which they are attached to the sclerotic. When one or more of the recti had been cut; the effect of opera tions increasing the pull of the obliques was intensified.
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