A Manual of Ophthalmic Practice |
From inside the book
Results 1-5 of 62
Page 2
... direction OH , which 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 ...
... direction OH , which 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 ...
Page 3
... 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 the degree of inclination of their ...
... 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 the degree of inclination of their ...
Page 8
... direction meet in some point 7 on the axis , and this point is the virtual focus of the point L. Foci in double concave lenses . - In double con- cave lenses there are only virtual foci , whatever the dis- tance of the object . In Fig ...
... direction meet in some point 7 on the axis , and this point is the virtual focus of the point L. Foci in double concave lenses . - In double con- cave lenses there are only virtual foci , whatever the dis- tance of the object . In Fig ...
Page 10
... direction A A ' , will emerge parallel to its first direction ( see Fig . 2 , p . 2 ) ; the point O , at which the right line cuts the principal axis is , therefore , the optical centre . Every right line PP ' ( Fig . 11 ) which P. C P ...
... direction A A ' , will emerge parallel to its first direction ( see Fig . 2 , p . 2 ) ; the point O , at which the right line cuts the principal axis is , therefore , the optical centre . Every right line PP ' ( Fig . 11 ) which P. C P ...
Page 11
... direction of the emer- gent ray is , however , parallel to that of the incident ray . So long as the secondary axes make only small angles with the principal axis , all that has been said about the principal axis is applicable to them ...
... direction of the emer- gent ray is , however , parallel to that of the incident ray . So long as the secondary axes make only small angles with the principal axis , all that has been said about the principal axis is applicable to them ...
Other editions - View all
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,...