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.

    12/184
    Section XL—Astigmatism. Varieties. Relative Frequency of Asthenopia in Astigmatism. How Caused. Treatment 7^ XII.—Anisometropia. Varieties. Binocular Vision. Treatment ... ... ... ... ... gg 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 Insufificiency. Definition. Hetero- phoria. Exophoria. Convergence Insuffi- ciency. Esophoria. Hyperphoria. Insuffi- ciency of the Obliques ... ... ... ... 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 ... ... ... 130 VIII.—In Myopia. The Myopic Eye. Treatment ... 131 IX. — In Astigmatism and Anisometropia 136 X. —Prisms. Decentering Lenses 137 XL—Tenotomy for the Relief of Muscular Asthenopia 140 XII.—Recapitulation 145 PART IV.—RETINAL ASTHENOPIA. Section I.—Physiological Considerations 151 II.—Symptoms 153 III. —Table of Causes ... 155 IV. —Retinal Strain from Abuse. Neurasthenic Retinal Asthenopia. Reflex Amblyopia ... 155 v.—Sun-blindness. Night-blindness 157 yi.—Snow-blindness 158 VII.—Electric Light-blindness 159 VIII.—Lightning-blindness 161 IX.—Erythropsia... 161 X.—Treatment 162 Note : On the Centering of Glasses 163