The student's guide to diseases of the eye . f the light need not be changed. Thehand which carries the lens should be steadied byresting the little or ring finger against the patientsbrow or temple. We usually begin by looking for the optic disc,which is one of the most important and easily seenparts. As the disc lies to the nasal side of the pos-terior pole of the eye, the cornea must be rotated alittle inwards, i. e. the back of the eye outwards, inorder to bring the disc opposite the pupil, when theobserver is immediately in front; the right eye, e. g.,must be directed to the observers rig
The student's guide to diseases of the eye . f the light need not be changed. Thehand which carries the lens should be steadied byresting the little or ring finger against the patientsbrow or temple. We usually begin by looking for the optic disc,which is one of the most important and easily seenparts. As the disc lies to the nasal side of the pos-terior pole of the eye, the cornea must be rotated alittle inwards, i. e. the back of the eye outwards, inorder to bring the disc opposite the pupil, when theobserver is immediately in front; the right eye, e. g.,must be directed to the observers right ear, or tothe uplifted little finger of his mirror-hand. Thepatient must turn his eye, not his head, in the re-quired direction. The lens should be held about # But many learn to see the image more quickly and easilyby placing a convex lens of 4 D. behind the mirror. If theobserver wears glasses for reading he should wear them, or puta lens of the same strength behind the mirror, for the indirectexamination. u OPHTHALMOSCOPIC EXAMINATION. OPHTHALMOSCOPIC EXAMINATION 45 2—3, and the observers eye be about 15, from thepatients eye; the image of the fundus being formedin the air 2 or 3 in front of the lens will thus besituated about 10 from the observer. The bright red glare (from the choroid) will beobvious enough; but most beginners find some diffi-culty in avoiding the reflection of the mirror fromthe patients cornea, and in adjusting the accommo-dation and the distance of the head, so as to see theimage clearly. The head must be slowly moved alittle further from or nearer to the patient, and atthe same time an attempt made to adjust the eyes(both being kept open) for a point between the ob-server and the lens. As a rule the disc and retinalvessels are seen clearly at the first sitting. The optic disc—ending of the optic nerve in theeye above the lamina cribrosa, optic papilla (Figs. 32and 34)—is round, well defined, much lighter incolour than the fiery red of the surr
Size: 1284px × 1945px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, booksu, booksubjecteye, booksubjectophthalmology
