Illumination system for indirect ophthalmoscope

摘要

The invention relates to a lighting appliance for generating a light beam for indirect ophthalmoscopy which appliance comprises a housing with a beam outlet aperture through which the beam leaves the housing and first and second means in the housing to respectively modify the color characteristics and the cross-section of the beam leaving the aperture. An externally accessible operating element is provided on the housing which can be independently adjusted to selectively control the first and second means.