A rare and technically interesting antique Genothalmic retinoscope dating to 1915, representing an important early example of electrically powered ophthalmic examination instruments. This instrument is one of the early models supplied by direct electric current rather than reflected light or batteries — a significant step forward in the standardization and reliability of retinoscopy at a time when electric power was just becoming widely available in clinical settings.
The retinoscope features a round angled mirror with a 2mm central opening, through which the examiner observes the reflex of light from the patient’s retina to determine their refractive error. The light focus can be adjusted by sliding the knurled ring at the base of the neck up and down, allowing the examiner to switch between streak and spot retinoscopy techniques. A silver colored rheostat ring at the top of the base provides precise control over the brightness of the illumination.
The instrument was designed for use with the Transformer for Genothalmic Diagnostic Instruments, which connected it to the electric supply. This transformer is marked at 115 volts and 60 cycle AC, and features a screw attachment for plugging into a lamp-type socket — reflecting the practical realities of clinical electrical supply in the early 20th century.
A highly collectible and historically significant piece of early electric ophthalmic instrument history, in fine original condition.
