These function in eye protection fron ionizing blue light, which they absorb, but not directly in vision, since they cannot be converted to retinal (also called retinaldehyde or vitamin A aldehyde).
These function in eye protection from ionizing blue light, which they absorb. These two specific xanthophylls do not function in the mechanism of sight, since they cannot be converted to retinal (also called retinaldehyde or vitamin A aldehyde).