visual purple


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  • noun

Synonyms for visual purple

a red photopigment in the retinal rods of vertebrates

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.
They can detect any glimmer, or trace of movement, thanks to a chemical in the eyes known as visual purple (found in the eyes of all birds and mammals).
Members of the Karta team include strategic partners CACI, SRA, and IBM; and product and service providers 3DSolve, Advancia, Alion Science, Allen Interactions, Brainshark, Carney, Coastal, CollabWorx, CompeteNet, Eagle Systems, EG&G, Envisage, FC Business Systems, Information Experts, Intergraph, LMR, MTS Technologies, NGRAIN, Orion Technology, Pinneast, SIMmersion, Sparta, Stanley Associates, SumTotal, The Logistics Company, Thomson NETg, and Visual Purple.