Slit Lamp Biomicrography is the photography of the structures of the eye with a specially designed horizontally mounted microscope. The primary illumination for the microscope is produced by a light which can be adjusted from a very broad pattern to a very narrow slit of light. It is from this slit of light that the Slitlamp derives its name. The slit can be used to isolate structures in the eye. The photograph above illustrates the use of a narrow slit of light to identifiy the surfaces of the cornea and lens of the eye.
Specular Micrography is a special type of slitlamp photography to photograph the individual cells on the back side of the cornea called the corneal endothelium. These photographs are used by physicians to help determine the state of health of the cornea.
Goniophotography Auxiliary lenses are sometimes used with a photo slit-lamp to photograph the inner structures of the eye that cannot be directly viewed with the slit-lamp. The most common lens type is the gonio contact lens that utilises internal mirrors angled at approximately 60° to provide observation of the filtering angle of the anterior chamber. Other mirrors are used to visualize the iris, ciliary body and peripheral retina.