photoreceptor
Pronunciation: FOH-toh-ree-SEP-tor
Specialized retinal cells (rods and cones) that detect light and initiate the visual transduction process.
Full Definition
Photoreceptors are highly specialized neurons in the outer retina responsible for detecting light and converting it into electrical signals through the process of phototransduction. The two main types are rods (responsible for dim light vision and motion detection) and cones (responsible for color vision and high acuity vision). Photoreceptor dysfunction underlies many inherited retinal dystrophies, and understanding their physiology is essential for interpreting electrophysiological testing and genetic counseling in neuro-ophthalmological practice.
Usage
Usage note: Encompasses both rods and cones; critical for understanding retinal diseases.
In Context
- "The inherited retinal dystrophy primarily affected rod photoreceptors, sparing cone function initially." — genetic ophthalmology report
- "Photoreceptor loss was evident on optical coherence tomography as thinning of the outer nuclear layer." — retinal imaging report