An instrument that records the electrical activity of the retina to measure how well the eye responds to light.
From electro- + retino- + -graph (recording instrument, from Greek graphein 'to write'). Emerged alongside electroretinography in the 20th century.
This machine is brilliant for diagnosing inherited eye diseases and testing new treatments because it measures what your retina's cells are actually doing electrically, not just what you can see.
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