Eyestrain (commonly called asthenopia) / by Ernest Clarke.

  • Clarke, Ernest, 1857-1932.
Date:
1892
Catalogue details

Licence: Public Domain Mark

Credit: Eyestrain (commonly called asthenopia) / by Ernest Clarke. Source: Wellcome Collection.

Provider: This material has been provided by University of Bristol Library. The original may be consulted at University of Bristol Library.

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    Section XI.—Astigmatism. Varieties. Relative Frequency of Asthenopia in Astigmatism. How Caused. Treatment 79 XII.—Anisometropia. Varieties. Binocular Vision. Treatment ... ... ... ... ... 89 PART III.—MUSCULAR ASTHENOPIA. Section I.—Anatomical and Physiological Considerations.., 97 II. —Relation of the two Eyes to each other in Normal Vision. Test for Latent Deviation (distance) 103 III. —Convergence. Nagel's Metre-Angle. Ampli- tude of Convergence. Test for Latent Deviation (near vision). Relation between Accommodation and Convergence. Fusion Supplement 105 IV. —Muscular Insufficiency. Definition. Hetero- phoria. Exophoria. Convergence Insuffi- ciency. Esophoria. Hyperphoria. Insuffi- ciency of the Obliciues 115 v.—Table of Causes of Muscular Asthenopia ... 126 VI.—Muscular Asthenopia in Emmetropia. Neuras- thenic Asthenopia. Treatment 127 VII—Muscular Asthenopia in Ametropia; in Hyperopia. Treatment 13° VIII.—In Myopia. The Myopic Eye. Treatment ... 131 IX. —In Astigmatism and Anisometropia 136 X. —Prisms. Decentering Lenses I37 XL—Tenotomy for the Relief of Muscular Asthenopia 140 XII.—Recapitulation ^45 PART IV.—RETINAL ASTHENOPIA. Section I.—Physiological Considerations iSi II.—Symptoms ^53 III. —Table of Causes ^55 IV. —Retinal Strain from Abuse. Neurasthenic Retinal Asthenopia. Reflex Amblyopia ... i55 v.-Sun-blindness. Night-blindness I57 yi—Snow-blindness VIL—Electric Light-blindness ... ^59 VIII.—Lightning-blindness ... IX.—Erythropsia X.—Treatment Note : On the Centering of Glasses 163 161 161 162