A Handbook of the diseases of the eye and their treatmentP. Blakiston, Son, 1892 - 318 pages |
From inside the book
Results 1-5 of 48
Page 1
... rays . " A ray of light , passing from one medium into another of different density , becomes deviated in its path , and is said to be " refracted . " The phenomenon itself is called " refraction . " A ray of light ( a b , Fig . 1 ) ...
... rays . " A ray of light , passing from one medium into another of different density , becomes deviated in its path , and is said to be " refracted . " The phenomenon itself is called " refraction . " A ray of light ( a b , Fig . 1 ) ...
Page 2
... rays must pass in order that they may not undergo deviation . * FIG . 3 . C b P Ր d F Any rays passing through the optical centre , except the prin- cipal ray or axis , are called Secondary Rays . All the other rays of the pencil ...
... rays must pass in order that they may not undergo deviation . * FIG . 3 . C b P Ր d F Any rays passing through the optical centre , except the prin- cipal ray or axis , are called Secondary Rays . All the other rays of the pencil ...
Page 3
... rays , after passing through the lens , are parallel . In like manner , F Ө FIG . 5 . rays from F ' ' would focus at 0 , and hence these two points are termed Conjugate Foci . If the point ( 0 , Fig . 5 ) from which the rays come be ...
... rays , after passing through the lens , are parallel . In like manner , F Ө FIG . 5 . rays from F ' ' would focus at 0 , and hence these two points are termed Conjugate Foci . If the point ( 0 , Fig . 5 ) from which the rays come be ...
Page 4
... rays converging toward V from the other side of the lens will be united by the lens at 0 . A Concave Lens ( L , Fig . 6 ) makes parallel rays of light ( a bede ) divergent on passing through it ; and if the direction of the divergent ...
... rays converging toward V from the other side of the lens will be united by the lens at 0 . A Concave Lens ( L , Fig . 6 ) makes parallel rays of light ( a bede ) divergent on passing through it ; and if the direction of the divergent ...
Page 5
... rays coming from the various points of an object . For example : if OB ( Fig . 7 ) be the object , and a pencil of rays pass from its upper end , 0 , through the convex lens , L , they will be united again at O on the secondary axis ...
... rays coming from the various points of an object . For example : if OB ( Fig . 7 ) be the object , and a pencil of rays pass from its upper end , 0 , through the convex lens , L , they will be united again at O on the secondary axis ...
Contents
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Common terms and phrases
acuteness of vision affection amblyopia ametropia amplitude of accommodation angle anterior chamber appearance aqueous humor astigmatism atrophy atropine axis bandage become blennorrhoea bulbar capsule cataract cause centre chamber choroid chronic cicatrix ciliary ciliary body color concave conjunctiva convergence convex cornea cure defect dilated diplopia disease distance emmetropic epithelium external rectus eyeball eyelids fibres flap focus forceps foreign body glass glaucoma Graefe's hemianopsia hemorrhages horizontal hypermetropia incision infiltration inflammation iridectomy iris iritis lachrymal latter layers lens lesion liable light macula lutea margin method metres mirror motion muscle myopia normal object occurs opacity operation Ophthal ophthalmia ophthalmoscope optic nerve optic papilla orbital palpebral paralysis passed patient portion posterior prolapse pupil purulent rays refraction result retina sclerotic seen skin sometimes stage strabismus surface surgeon sutures swelling symptoms tarsus tension third nerve tion tissue Treatment tumor ulcer upper lid usually vertical meridian vessels vitreous humor wound
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