Why Can’t We See Ultraviolet Light? An Evolutionary Biologist Explains

Humans see only a narrow band of light because the eye’s lens blocks most ultraviolet radiation before it reaches the retina.

That UV filtering likely evolved to protect eye tissues, keep the lens clear, and preserve sharp color vision.

So human lack of UV vision is less a defect than an evolutionary trade-off for eye health and visual clarity.

People without a lens, such as some aphakic patients, can sometimes perceive ultraviolet light.