On defects of vision which are remediable by optical appliancesMacmillan and Company, 1877 - 145 pages |
Common terms and phrases
accommodation and convergence accommodation effort ametropia ametropic amount appears asthenopia astigmatic eye astigmatism atropia axis bases inwards binocular vision centimetres centres chief meridians ciliary muscle concave lenses convergence effort convex glasses convex lens cornea correction Crown 8vo curvature defect degree of convergence degree of myopia degrees of hypermetropia diagram diminish dioptrics of accommodation diplopia direction Diseases distant objects divergence Donders emmetropic eye equal exert externi far-point five dioptrics focal length four dioptrics function fusion half dioptrics hence horizontal hypermetropic eye images increase interni lecture looking manifest metre millimetres myopic eye near-point nearer normal numerous Illustrations ocular ophthalmoscope optical orthoscopic Owens College parallel rays patient placed position power of accommodation precisely presbyopia presbyopic prisms produced Professor range of accommodation recti refraction relative accommodation render require retina single vision singleness of vision spectacles squint strain tension three dioptrics vergence vertical lines visual angle visual lines