Skip to Content


Pronunciation: ret'i-nal


  1. Relating to the retina.
  2. Retinaldehyde, most commonly referring to the all-trans form; participates in the visual process; 11-cis-retinal binds with an opsin to form iodopsin or rhodopsin; light causes the formation of all-trans-retinal, which dissociates from the protein.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

© Copyright 2018 Wolters Kluwer. All Rights Reserved. Review date: Sep 19, 2016.