DAVID RAY VANCE |
 | Theory of the Opthalmoscope As ordinarily seen, the pupil appears black because light which leaves it is necessarily reflected back the way it came. If eye espied so as to intercept returning rays, interior will be illuminated. In children of dark complexion, the fundus not infrequently presents a bright lustre which changes with movements of the mirror. Most marked along blood-vessels, resembles shimmer of watered silk. Experience is necessary to avoid judging |