An ophthalmoscope, with monochromatic and red free light, with a varying aperture, a luminous plane and concave retinoscope, and a hand slit lamp

摘要

297,652. Wilson, A. April 4, 1928. Ophthalmoscopes. -An instrument which can be used as an ophthalmoscope, a retinoscope or a slit lamp, comprising a line source of illumination A, a conderser B, focusing lenses F, G, an oblique mirror H and a battery of inspection lenses K, is fitted with a platform b@ situated in front of the condenser B for carrying a movable slit D and colour filter E. Both the slit D and the colour filter E are mounted on spring- controlled pivoted levers, so that either may be moved into the light beam and held there by springs d5, which latter may be released by knobs d8. An iris diaphragm is carried above this platform b9 to adiust the beam to the size of the pupil of the eye under examination. The oblique mirror H is mounted in a rotatable head so that the axis of the slit may be changed to any desired meridian and is provided with a sighing aperture and an eyepiece .T. The mirror H is also slidab'e transversely in its mount, which is made cubical or otherwise, and of two portions hinged together so that the holder is divided diagonally. The lamp A is illuminated by current from mains through a rheostat or from cells a1 in the base of the instrument.