A Practical Guide to the Examination of the Eye: For Students and Junior Practitioners |
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Page xii
... visual angle • 36. Snellen's types ( about size ) . 37. Author's frame of test types , with readily movable rows of letters 38. Cohn's test types 39. Hair optometer 40. Mode of measuring near point PAGE 62 63 67 68 71 · 73 75 76 42 ...
... visual angle • 36. Snellen's types ( about size ) . 37. Author's frame of test types , with readily movable rows of letters 38. Cohn's test types 39. Hair optometer 40. Mode of measuring near point PAGE 62 63 67 68 71 · 73 75 76 42 ...
Page 66
... five equal parts . The dimensions are such that , at the distance at which the normal eye should see them , the larger squares subtend a visual angle of five minutes . It follows that the small squares contained within.
... five equal parts . The dimensions are such that , at the distance at which the normal eye should see them , the larger squares subtend a visual angle of five minutes . It follows that the small squares contained within.
Page 67
... visual angle of one minute , which has been calculated to be the minimum visual angle for the normal eye . ( The visual angle referred to is the angle formed by the two lines from the extremities of an object at the nodal point of the ...
... visual angle of one minute , which has been calculated to be the minimum visual angle for the normal eye . ( The visual angle referred to is the angle formed by the two lines from the extremities of an object at the nodal point of the ...
Page 68
... visual acuity H AV LTJ is expressed thus : V ( vision ) == 1. If no- thing smaller than the fifth line down can be 6 seen , then V = √1⁄2 = 1 . Vision is frequently found to exceed the accepted standard , and it may be § , or even . 6 ...
... visual acuity H AV LTJ is expressed thus : V ( vision ) == 1. If no- thing smaller than the fifth line down can be 6 seen , then V = √1⁄2 = 1 . Vision is frequently found to exceed the accepted standard , and it may be § , or even . 6 ...
Page 69
... The tests are usually made in daylight , which is , of course , subject to considerable variation . A lessened light will mean reduced visual acuity . To avoid inaccuracy in results , it has been suggested that TEST TYPES . 69.
... The tests are usually made in daylight , which is , of course , subject to considerable variation . A lessened light will mean reduced visual acuity . To avoid inaccuracy in results , it has been suggested that TEST TYPES . 69.
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A Practical Guide to the Examination of the Eye: For Students and Junior ... Simeon Snell No preview available - 2015 |
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abduction amblyopia ametropia angle ascertained astigmatism atropine axis binocular vision blind candle centre choroidal ciliary muscle Cloth cocaine College Coloured Plates concave convergence convex cornea correct Crown 8vo cylinders detected deviation diameter dilated dioptres diplopia direct method Diseases distance Edinburgh Royal Infirmary Edition employed Engravings examination exophoria eyeball false image field of vision fixation flame focal illumination foreign body full-page fundus glass glaucoma hemianopsia homatropine homonymous horizontal Hospital hypermetropia Illustrations indicate iris keratometer lens lenses letters light measured Medical Medicine meridian metre-angles metres mydriasis mydriatic myopia nett normal oblique observer ocular opacities Ophthalmic ophthalmoscope ophthalmoscopic mirror optic disc optic nerve optometer paralysed Pentland's Students perimeter Physician placed position Price Priestley Smith's prism Professor pupil recti rectus reflex refraction retina retinoscopy right eye scotoma scotomata shadow side sight hole Snellen's spherical strabismus Surgeon Surgery test object test types tion trial frame vertical visual field
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