Vision

(redirected from visual purple)
Also found in: Dictionary, Thesaurus, Medical, Legal, Encyclopedia, Wikipedia.

Vision

References in periodicals archive ?
Optograms are hard to obtain from humans because the human eye does not have that much visual purple.
That's because night blindness is usually due to a lack of the substance visual purple which requires beta carotene - found in the vegetable - to produce it.
Ingestion of vitamin A can help improve vision, as visual purple is part of the light-sensitive rod cells in the retina of the eye, helping the eye adapt to dim light, hence the belief that eating carrots can improve one's night vision.