Zirm M, Hofmann H, Zirm K
Klin Monbl Augenheilkd. 1978 Feb;172(2):145-9.
The absorption of retina and uvea pigment is very high in infrared light of 700-1000 nm, whereas hemoglobin absorbs light of lower frequencies much better. Density-Slicing is performed by a computer receiving information from an infrared film. Pigments of nevi and melanomas are demonstratable by this method and tumor growth is possible to see as well.