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aqueous humor astigmatic eye axis base curve bend bifocal Bnsley camera center of curvature center of rotation chromatic aberration color concave condition converging lens convex cornea or lens correction Crystalline lens cylinder D. C. ax decentration deviation different meridians distance Distortion diverging lens Doctor Emsley and Swaine equal Esotropia eyeball focal length focal point focused front horizontal index of refraction infra red inverted layer lens measure lens the bases lenses medium meniscus meter mirror muscles muscular defects myopic astigmatism negative object oblique direction parallel rays pass patient perfect perpendicular pieces of glass plane point of reversal positive lens power of accommodation prescription principal meridian prism diopter protective glass ray of light refracting angle refractive power retina retiniscope right angles shown in Figure sine Southall spectacle glass sphere spherical aberration spherometer Spinney surface tendency to turn thickness thin Thorington tion toric lens ultra violet wave lengths