[On an apparatus for a study of the eye in the light of different spectral make-up].
D004864:Equipment and Supplies; D006801:Humans; D008027:Light; D009885:Ophthalmology / Q000600:supply & distribution*; D009887:Ophthalmoscopy / Q000600:supply & distribution*
OPHTHALMOLOGY/equipment and supplies; OPHTHALMOSCOPY/equipment and supplies