The above pictures were taken through the slit-lamp. What
slit-lamp techniques have been used to obtain these views?
A is scleral scatter (it is an indirect illumination created by decentering
the slit beam and directing a broad beam to the temporal sclera. The
bright light directed to the sclera travels across the cornea like
B is iris transillumination achieved through retroillumination of the
(This technique requires an undilated pupil and is created by making
axial light beam shine into the small pupil and reflect off the retina.
beam aperture should be the same or smaller than the diameter of the pupil
to prevent iris reflection.)