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 x
... yards and upwards , an adequate power of eyesight must evidently be the prime ingredient necessary to insure the success of the marksman . The more this fact is appreciated , the more the importance will be felt of giving attention to ...
... yards and upwards , an adequate power of eyesight must evidently be the prime ingredient necessary to insure the success of the marksman . The more this fact is appreciated , the more the importance will be felt of giving attention to ...
Page 51
... yards , the space within which he could be hit by the bullet in the latter part of its course would be limited to 110 yards ; if at 800 yards , the limit of the dangerous space would be lessened to 45 yards ; if at 1,000 , there would ...
... yards , the space within which he could be hit by the bullet in the latter part of its course would be limited to 110 yards ; if at 800 yards , the limit of the dangerous space would be lessened to 45 yards ; if at 1,000 , there would ...
Page 52
... yards , is aligned with these sights of the rifle , it is obvious that an eye , if it tried to do so , could not see the three different objects with equal distinctness at one and the same time . The recruit , therefore , is rightly 52 ...
... yards , is aligned with these sights of the rifle , it is obvious that an eye , if it tried to do so , could not see the three different objects with equal distinctness at one and the same time . The recruit , therefore , is rightly 52 ...
Page 165
... yards under ordinary illumination , that is , in a moderately clear daylight , and with no more striking con- trast of background than what is met with in ordinary fields or moorland . A sentry on an advanced post who could not distin ...
... yards under ordinary illumination , that is , in a moderately clear daylight , and with no more striking con- trast of background than what is met with in ordinary fields or moorland . A sentry on an advanced post who could not distin ...
Page 166
... yards may be applied by means of Snellen's types thus : -Assuming the height of a man to be that at which the height for infantry is calculated in rifle practice , viz . 6 feet , the visual angle under which he would be seen at a ...
... yards may be applied by means of Snellen's types thus : -Assuming the height of a man to be that at which the height for infantry is calculated in rifle practice , viz . 6 feet , the visual angle under which he would be seen at a ...
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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