retinal : Idioms & Phrases

• noun a visual receptor cell in the retina that is sensitive to bright light and to color
  cone cell; cone.
  

WordNet

• noun visual impairment resulting from the retina becoming separated from the choroid in the back of the eye; treated by photocoagulation
  detached retina; detachment of the retina.
  

WordNet

• noun a red photopigment in the retinal rods of vertebrates; dissociates into retinene by light
  visual purple; rhodopsin.
  

WordNet

• (Physiol. Chem.), the visual purple.

Webster 1913

• noun a visual receptor cell that is sensitive to dim light
  rod cell; rod.
  

WordNet

• noun biometric identification by scanning the retina of the eye
  
  • identification by retinal scanning is complicated by eye movements

WordNet