The Optician's manual v. 2, 1911, Volumen2

accommodation acuteness of vision afford amblyopia amount appear asthenopia ASTIGMATIC EYE atropine axis 90 become binocular vision blurred cause ciliary muscle close concave cylinder concave lens condition convergent strabismus convex glasses convex lens cornea correction crystalline lens curvature deviation diffusion diplopia direction disk distance distant vision distinct emmetropia emmetropic emmetropic eye enter the eye error of refraction exophoria eye-ball focus focused fundus hence heterophoria horizontal meridian hyper hypermetropia hypermetropic astigmatism hypermetropic eye hyperphoria impaired inches increase indistinct internal recti irregular astigmatism keratoscope latent latter lenses measure method metropia muscular myope myopia myopic astigmatism myopic eye normal object oblique ophthalmoscope optic optician parallel rays patient placed position presbyopia principal meridians prism proper pupil rays of light reading recti muscles rectus refractive power result retina retinoscope right angles rotated spasm sphere squinting surface symptoms tion trial frame twenty feet usually vertical line vertical meridian visual wear yellow spot