The illustrated optical manual, or Handbook of instructions for the guidance of surgeons in testing quality and range of vision, and in distinguishing and dealing with optical defects in general / by Surgeon-General Sir T. Longmore.

  • Thomas Longmore
Date:
1888
Catalogue details

Licence: Public Domain Mark

Credit: The illustrated optical manual, or Handbook of instructions for the guidance of surgeons in testing quality and range of vision, and in distinguishing and dealing with optical defects in general / by Surgeon-General Sir T. Longmore. Source: Wellcome Collection.

Provider: This material has been provided by the Harvey Cushing/John Hay Whitney Medical Library at Yale University, through the Medical Heritage Library. The original may be consulted at the Harvey Cushing/John Hay Whitney Medical Library at Yale University.

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    Emnietropia, diagnosis of, 59 — objective diagnosis of, 110 — optical conditions in, 59 Equiconcave spectacles, ] 9 Equiconvex spectacles, 19 Estimate of astigmatism, 89 Exaggeration of myopia, 68 Examination, visual, of recruits, 189 of soldiers, 195 Eye, accommodatory power of, 125 — assumed blindness of, 217 — lateral illumination of, 196 — left, aiming with, 217 — loss of sight of one, 210 — movements of, 13 — optical examination of, 2 — protectors, 47 — range of motion of, 15 Eyeglasses, 42 ■— single, 42 Eyes, assumed visual defects of, 217 Field of view, 14 — of vision, 11 binocular, 12 ■ determination of, 13 - limits of, 12 monocular, 11 objects in, 15 shape of, 13 Finite rays, 18 Focal adjustment, varieties of, 57 distances of lenses, 24 Formula for range of accommodation, 126 Franklin glasses, 45 Fraud, detection of, in alleged defects of vision, 217 Function of accommodation, 125 Hypermetropia, 73 — absolute, 78 — acquired, 74 -— degree of, 80 — diagnosis of, 78 ■— facultative, 78 — latent, 77 — lens for correction of, 81 ■— manifest, 77 — and military service, 82 — objective diagnosis of, 110 — optical causes of, 74 — relative, 78 — remote causes of, 74 — symptoms of, 75 Hypermetropic strabismus, 76 — vision, 75 Hypometropia, 57 Illttaiixatiox, lateral, of eye, 196 •— of objects, 15 Images, crossed, 4 — formed by lenses, 36 — homonymous, 4 — in strabismus, 141 — on retina, 9 — retinal, inversion of, 9 sizes of, 11 Infinite rays, 17 Isometropia, 58 Jageb's test-types, 157 Judging distance, 50 drill, 224 importance of, 50 practice of, 51 by sight, 50 by sound,224 Glass, crown, for spectacles, 37 Glasses, duplex focal, 45 — eye, 42 -— Franklin, 45 — pantoscopic, 42 — periscopic, 43 — prismatic, 48 — spherical, imperfections of, 43 ■— stenopoeic, 49 Goggles, 47 — issued to troops in Egypt, 48 Hair-wire optometer, 156 Hemeralopia, 169 ■— definition of, 170 — simulated, 170 Hemiopia, 171 — definition of, 171 FvERATOSCOPY, 115 — arrangements necessary for, 116 ■ appearances in, 117 — concave mirror, 116 — correction of ametropia by, 211 — diagnosis by, 119 ■— estimate of ametropia by, 119 — in military practice, 116 — nature of, 118 — plane mirror, 121 Latest hypermetropia, 77 Lateral illumination of eye, 196 Law of visible direction, 9 Lens, aperture of, 26 ■— concave, power of, 24 — convex, power of, 24 — cylindrical, power of, 35