The above pictures were taken through the slit-lamp. What slit-lamp techniques have been used to obtain these views?
Answer 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 a fiber-optic light pipe.) B is iris transillumination achieved through retroillumination of the retina (This technique requires an undilated pupil and is created by making an axial light beam shine into the small pupil and reflect off the retina. The beam aperture should be the same or smaller than the diameter of the pupil to prevent iris reflection.)
