It is based on the notion that light of a certain wave length causes substances to be released from a highly developed photosensitive molecule in the retina and these substances stimulate the retina

LADD-FRANKLIN THEORY: "Ladd Franklin Theory is a formerly influential but now superseded theory of colour vision."
Cite this page: N., Pam M.S., "LADD-FRANKLIN THEORY," in, May 11, 2013, (accessed August 2, 2021).