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 |
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Page xix
... feet 187 Visual angles of target bull's - eyes By square dots at 15 feet 187 183 By square dots at 10 feet 187 Only lowest quality of V. proved by the test - dots 188 various distances 184 • Directions on mode of using test- 185 dot ...
... feet 187 Visual angles of target bull's - eyes By square dots at 15 feet 187 183 By square dots at 10 feet 187 Only lowest quality of V. proved by the test - dots 188 various distances 184 • Directions on mode of using test- 185 dot ...
Page 12
... the other free , at a distance of about two feet in front of a black board placed perpendicularly to the line of. 12 CHAP . I THE ILLUSTRATED OPTICAL MANUAL Binocular field of vision Measurement of monocular and bin- ocular fields of ...
... the other free , at a distance of about two feet in front of a black board placed perpendicularly to the line of. 12 CHAP . I THE ILLUSTRATED OPTICAL MANUAL Binocular field of vision Measurement of monocular and bin- ocular fields of ...
Page 13
... feet off , and face to face with the patient , desires him to close one eye , the right , for example , and at the same time closes his own left eye opposite to it . He now desires the patient to look steadily into his right eye , and ...
... feet off , and face to face with the patient , desires him to close one eye , the right , for example , and at the same time closes his own left eye opposite to it . He now desires the patient to look steadily into his right eye , and ...
Page 17
... feet distant from the spectator are regarded as parallel rays , and , from this distance up to that of a fixed star , the rays reaching the eye are ordinarily spoken of as infinite rays . The angular divergency of a pencil of rays ...
... feet distant from the spectator are regarded as parallel rays , and , from this distance up to that of a fixed star , the rays reaching the eye are ordinarily spoken of as infinite rays . The angular divergency of a pencil of rays ...
Page 18
... feet they would be practically parallel . 3 4 4 3 4 5 6 7 8 6 times spoken of as finite rays , and the divergency of such rays increases in proportion to the proximity of objects to the eye . On referring to fig . 17 , it will be seen ...
... feet they would be practically parallel . 3 4 4 3 4 5 6 7 8 6 times spoken of as finite rays , and the divergency of such rays increases in proportion to the proximity of objects to the eye . On referring to fig . 17 , it will be seen ...
Other editions - View all
The Illustrated Optical Manual: Or Handbook of Instructions for the Guidance ... T. Longmore No preview available - 2018 |
The Illustrated Optical Manual, Or Handbook of Instructions for the Guidance ... Thomas Longmore, Sir No preview available - 2016 |
Common terms and phrases
accommodation acuteness of vision amblyopia ametropia ametropic amount of Acc appear army asthenopia astigmatic eye astigmatism axis binocular vision bull's-eye cause centre ciliary muscle colour colour-blindness concave lens convex lens cornea correcting lens correction Crown 8vo curvature cylindrical lens defect Diagnosis diffusion dioptric diplopia direction distance distant objects distant point distinct vision emmetropic examination exerted exist eye under observation feet focal fundus glasses inches keratoscopy left eye lenses lessened medical officer meridian Mc military service mirror myope myopic neutralised normal acuteness ocular ophthalmoscopic optic parallel rays patient person placed point of distinct power of Acc practice principal focus principal meridians prism rays of light rays proceeding recruit refractive defect refractive power refractive quality regards rendered retina retinal images rifle right eye seen shadow sight soldier spectacles spherical strabismus surgeon target test-dots tion unfit visual acuteness visual angle visual lines
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