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Refraction and its Application to the
The Refraction of the EyePhysiological Optics
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aberration accom accommodation amount angle anisometropia aphakia appear astigmatism axis back central optic bifocal binocular vision blurred ciliary muscle concave concave lens condition considerable contact lenses convergence convex lens cornea corneal lens correction curvature curve cycloplegia cycloplegic cylinder defect deﬁnite degree deviation diameter difﬁculties dioptres dioptric diplopia direction distance distant vision divergent effect efﬁciency emmetropia emmetropic exophoria eye-strain ﬁeld ﬁgure ﬁnal ﬁrst ﬁtting ﬁxed focal glass horizontal hypermetropia increase inﬁnity inﬂuence insufﬁciency magniﬁed measured meridian metre modation myope myopia neutralisation normal object oblique occurs ocular ophthalmoscope optical centre optical system parallel rays patient peripheral plane position posterior presbyopia principal focus prism prismatic pupil rays of light reading reﬂected reﬂex refractive error refractive index refractive power retina retinal image retinoscopy rotation scleral seen spectacle lens sphere spherical squint sufﬁcient surface symptoms trial frame usually vertical visual acuity visual axes wherein