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![The refraction of the eye; including a complete treatise on ophthalmometry; . o. 1, 5^ to 12 inches. This last glass was ordered as a sphero-cylinder (plus spherewith a minus cylinder). The refraction of the eye; including a complete treatise on ophthalmometry; . o. 1, 5^ to 12 inches. This last glass was ordered as a sphero-cylinder (plus spherewith a minus cylinder).](https://c8.alamy.com/comp/2CHEN1R/the-refraction-of-the-eye-including-a-complete-treatise-on-ophthalmometry-o-1-5-to-12-inches-this-last-glass-was-ordered-as-a-sphero-cylinder-plus-spherewith-a-minus-cylinder-usually-in-a-case-with-as-large-amountof-mixed-astigmatism-as-in-this-case-we-prescribe-cross-cylindersbecause-it-gives-a-broader-field-of-vision-but-in-this-instanceso-much-of-the-glass-was-minus-and-so-little-plus-that-i-gavesphero-cylinders-had-the-hypermetropic-and-myopic-portionsof-the-astigmatism-been-nearly-or-exactly-equal-i-should-have-illustrative-cases-185-given-cross-cylinders-because-they-2CHEN1R.jpg)