This image courtesy M N Watts, The City University
[A
23K Jpg of this image is available
for downloading] A technique called ophthalmoscopy shines a light through
the pupil and lets us to look along the same path as the light is travelling.
No longer does the pupil appear black - all is revealed. Careful inspection
of the structures within the eye can indicate so much about a person's
general health and, of course, the health of their eyes: