Retinal sensory neurons. Rods (~120M): high sensitivity, scotopic, rhodopsin only, no colour. Cones (~6M): lower sensitivity, photopic, three opsin types (S/M/L) enabling trichromatic colour vision.
Retinal sensory neurons. Rods (~120M): high sensitivity, scotopic, rhodopsin only, no colour. Cones (~6M): lower sensitivity, photopic, three opsin types (S/M/L) enabling trichromatic colour vision.