Ophthalmoscope or fundus camera with fibre optic illumination= - and only indirect illumination of the entrance pupil

摘要

A contact lens (10, 10') fits on the cornea of a test person through which the inside of the eye can be observed, it is encircled by an inner ring (18, 18') of the optic fibres (38) and with an outer ring (16, 16') of optic fibres spaced from it. The light fibres are arranged in specific positions to form rings of specific radii whereby when the apparatus is in use the tips of the fibres form two predetermined angles for the inner and outer rings. Pref. the numerical aperture of the fibres is 0.55, the I.