Ophthalmoscopes

The ophthalmoscope directs a small beam of light through the patient’s pupil, which helps the medical practitioner detect any abnormalities on the lens of the eye, optic disc, vitreous humor, and the retina.

Believe it or not, the first ophthalmoscope was invented in 1847. English physician Charles Babbage created the first model, giving it to a fellow physician for testing before it was promptly set aside and forgotten.

In 1851, a brief four years after Babbage’s invention, Hermann von Helmholtz—a German physician and physiologist—created an identical instrument, without knowing Babbage’s model existed.

Helmholtz’ ophthalmoscope used a mirror to shine light into the patient’s eye, while the practitioner looked through a small opening in the mirror.

Because looking into the back of the eye resulted in a red reflection, Helmholtz attached a condenser lens, which produced a much sharper image that had to be magnified five times. This combination of a mirror and condenser lens was referred to as an

Now, ophthalmoscopes are hand-held with a small battery-powered lamp. The beam of light is directed with a mirrored prism. And of course, ophthalmoscopes magnify the image and have focusing options for the viewer.