A Manual of Ophthalmic Practice |
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Page 2
... light takes in the second medium , and of the angles SOA and HOB , which these rays form with the " normal " * AB , at right angles to the surface which separates the two media , the first is the angle of incidence and the other the ...
... light takes in the second medium , and of the angles SOA and HOB , which these rays form with the " normal " * AB , at right angles to the surface which separates the two media , the first is the angle of incidence and the other the ...
Page 3
... light is thus refracted twice in the same direction , and the eye which receives the emergent ray KH , sees the object O at O ' ; that is objects seen through a prism appear displaced towards its edge or summit . Prisms are numbered by ...
... light is thus refracted twice in the same direction , and the eye which receives the emergent ray KH , sees the object O at O ' ; that is objects seen through a prism appear displaced towards its edge or summit . Prisms are numbered by ...
Page 5
... light traverses a prism it is deflected towards its base . Foci in double convex lenses . - The focus of a lens is the point where the refracted rays or their pro- longations meet . Double convex lenses have what are known as real and ...
... light traverses a prism it is deflected towards its base . Foci in double convex lenses . - The focus of a lens is the point where the refracted rays or their pro- longations meet . Double convex lenses have what are known as real and ...
Page 6
... light form a divergent pencil , as shown ( Fig . 6 ) . The L F BAD FIG . 6 . luminous point being at L , by comparing the path of the diverging ray LB with that of the ray SB parallel to the axis , the former is found to make with the ...
... light form a divergent pencil , as shown ( Fig . 6 ) . The L F BAD FIG . 6 . luminous point being at L , by comparing the path of the diverging ray LB with that of the ray SB parallel to the axis , the former is found to make with the ...
Page 11
... light emitted from a point P ( Fig . 11 ) on the secondary axis PP ' , nearly coincide in the same point A- d -A b α FIG . 12 . of this axis P ' and accordingly as the distance from the point P to the lens is greater or less than the ...
... light emitted from a point P ( Fig . 11 ) on the secondary axis PP ' , nearly coincide in the same point A- d -A b α FIG . 12 . of this axis P ' and accordingly as the distance from the point P to the lens is greater or less than the ...
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Common terms and phrases
accommodation affected amblyopia anomaly of refraction anterior chamber appear asthenopia astigmatism atrophy atropine axis bandage become blood cataract cause centre chamber choroid ciliary region colour commenced concave lens congenital conjunctiva convergence convex lens cornea corneal margin corneitis curette curvature degree of myopia dilated dioptric direction disease displacement distance emmetropic examination extraction eyeball eyelids forceps foreign body fundus glasses glaucoma globe hæmorrhage horizontal hypermetropia hypermetropic astigmatism incision increased inflammation inflammatory injury intolerance of light iridectomy iris iritis keratitis knife lachrymal lenses less lids lines lint lotion muscle myopia object occur ocular opacity opaque operation ophthalmia ophthalmoscope optic disc orbit pain paralysis passed patient performed portion posterior presbyopia pupil rays of light removed retina retinal vessels right angles scissors sclerotic seen sight spots staphyloma strabismus suppuration surface sutures sympathetic ophthalmia symptoms synechia syphilitic tension tion treatment tumour ulceration usually vitreous wire speculum wound
Popular passages
Page 318 - Walsham, besides being an excellent surgeon, is a teacher in its best sense, and having had very great experience in the preparation of candidates for examination, and their subsequent professional career, may be relied upon to have carried out his work successfully. Without following out in detail his arrangement, which is excellent, we can at once say that his book is an embodiment of modern ideas neatly strung together, with an amount of careful organisation well suited to the candidate, and,...