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 2
... distance , colour , and most of the physical qualities of the object so depicted is produced in the mind of the observer . To effect the first of these conditions , the curvatures , refractive qualities , and mutual relations of the ...
... distance , colour , and most of the physical qualities of the object so depicted is produced in the mind of the observer . To effect the first of these conditions , the curvatures , refractive qualities , and mutual relations of the ...
Page 11
Sir Thomas Longmore. seen will vary inversely as its distance from the eye ; if the distance be fixed , the size of the visual angle will vary in a direct ratio with the size of the object . The angle is similar on each side of the point ...
Sir Thomas Longmore. seen will vary inversely as its distance from the eye ; if the distance be fixed , the size of the visual angle will vary in a direct ratio with the size of the object . The angle is similar on each side of the point ...
Page 12
... distance in front of the observer that the visual axes of the two eyes are practically parallel with one another , the limiting lines of visual perception or luminous impression on each side of the face form an angle of about 90 ° , so ...
... distance in front of the observer that the visual axes of the two eyes are practically parallel with one another , the limiting lines of visual perception or luminous impression on each side of the face form an angle of about 90 ° , so ...
Page 15
... distance of the object ; the measure of surface varies in proportion to the squares of the lineal measure at different distances . Illumination of Objects . - The quantity of light received on a given object , or unit of surface , is ...
... distance of the object ; the measure of surface varies in proportion to the squares of the lineal measure at different distances . Illumination of Objects . - The quantity of light received on a given object , or unit of surface , is ...
Page 16
... distance to which the object is removed , but so also will the apparent area of the object . If one object be placed at double the distance of the other , the area of its image on the retina will be reduced to one - fourth of that of ...
... distance to which the object is removed , but so also will the apparent area of the object . If one object be placed at double the distance of the other , the area of its image on the retina will be reduced to one - fourth of that of ...
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 candidate cause centre ciliary muscle colour colour-blindness concave lens convergence convex lens cornea correcting lens correction Crown 8vo cylindrical lens defect degree diagnosis dioptric diplopia direction distance distant objects distant point distinct vision effects emmetropic examination exerted exist eye under observation feet focal fundus glasses horizontal hypermetropic inches keratoscopy left eye lenses medical officer military service mirror myopic normal acuteness ocular ophthalmoscopic optic parallel rays patient person placed point of distinct power of Acc practice presbyopia principal focus prism rays of light recognised 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 vertical visual acuteness visual angle visual lines