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 14
... named , the eye is said to be directed upwards or downwards respectively ; and if to the inner or outer side of the vertical line just named , it is said to be turned inwards or outwards respectively . It is in accordance with these ...
... named , the eye is said to be directed upwards or downwards respectively ; and if to the inner or outer side of the vertical line just named , it is said to be turned inwards or outwards respectively . It is in accordance with these ...
Page 17
... named ; while , on the other hand , a similar shot or shell moving in a nearly direct line towards the eye can be seen because its image is sufficiently persistent , while , although it has no angular motion , its movement of approach ...
... named ; while , on the other hand , a similar shot or shell moving in a nearly direct line towards the eye can be seen because its image is sufficiently persistent , while , although it has no angular motion , its movement of approach ...
Page 35
... named will be the line of direction of the axis of the lens . To ascertain the Power of a Convex , Concave , or Cylindrical Lens . - This may be readily done in the case of a centric convex lens , even without a trial case of lenses ...
... named will be the line of direction of the axis of the lens . To ascertain the Power of a Convex , Concave , or Cylindrical Lens . - This may be readily done in the case of a centric convex lens , even without a trial case of lenses ...
Page 38
... named , than spectacles of the best crown glass , such as is specially manufactured for spectacle lenses . Quartz has the quality of double refraction , and although its effects may not be perceived by the eyes in thin lenses of low ...
... named , than spectacles of the best crown glass , such as is specially manufactured for spectacle lenses . Quartz has the quality of double refraction , and although its effects may not be perceived by the eyes in thin lenses of low ...
Page 41
... named for convex glasses . The necessity for the visual axis passing through the centre of each lens involves a slight difference in position of the lens , or in the adjustment of the frame , according to the purpose for which the ...
... named for convex glasses . The necessity for the visual axis passing through the centre of each lens involves a slight difference in position of the lens , or in the adjustment of the frame , according to the purpose for which the ...
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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