. The refraction of the eye; including a complete treatise on ophthalmometry; . inches. Ophthalmoscope. —M. D. at 95° and H. D. at 5°in each eye. Second test: one day later the ophthalmometer showed thesame reading. Test cards and trial R V — -2-0- ^ ^•~ 200 cyL,5°. D. cyl., 5°. + W.+ D. cyl., 95^L. V. = ,2_o_ : _2_o_ + w. + D. cyl., 95^ A third test confirmed this second, and the glasses wereordered as cross-cylinders. Cross-cylinders were prescribedbecause they defined the lettersbetter and felt easier to the eyesthan either sphero-cylinder intowhich they
. The refraction of the eye; including a complete treatise on ophthalmometry; . inches. Ophthalmoscope. —M. D. at 95° and H. D. at 5°in each eye. Second test: one day later the ophthalmometer showed thesame reading. Test cards and trial R V — -2-0- ^ ^•~ 200 cyL,5°. D. cyl., 5°. + W.+ D. cyl., 95^L. V. = ,2_o_ : _2_o_ + w. + D. cyl., 95^ A third test confirmed this second, and the glasses wereordered as cross-cylinders. Cross-cylinders were prescribedbecause they defined the lettersbetter and felt easier to the eyesthan either sphero-cylinder intowhich they could be wearing the glasses con-stantly for a week the doctorgot relief from his asthenopicsymptoms. I have had himunder observation for more thantwo years, and he wears thesame glasses with continued re-lief. It is comparatively a rareoccurrence for the axes of anastigmatism in the two eyes toslant in the same direction from the horizontal and vertical meridians ; and when it does hap-pen, usually, the asthenopia is more marked in such cases than. Fig. 86. 200 THE REFRACTION OF THE EYE in those cases where the axes slant an equal number of degreesin opposite directions from the vertical and horizontal merid-ians. For example, say the axis in each eye slants 15° towardthe temple from the vertical meridian, in which case, in hyper-metropic astigmatism, the cylinder would be worn at 105° rightej^e, and at 75° left eye. In the present case both axes standat 95°, slanting toward the temple in the right eye, and towardthe nose in the left eye, or in the same direction. ^ Case LXXXI. Mixed astigmatism against the rule righteye; No corneal astigmatism left eye^ hut the patient accepts aweak cylinder against the rule ; Patient is very nervous ; Markedasthenopia; Relief with glasses. —June 27, 1894, Mary M., agedtwenty-six years, in only fairly good health, and is very eyes have given her much trouble for the last four years,especially the ri
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