Light that is too short wavelength or high energy gets absorbed by the eye's surface before it can even get to the retina, and light that is too long wavelength doesn't have enough energy to stimulate our retina at all.
A superficie do ollo absorbe a luz con lonxitude de onda moi curta ou alta enerxía antes incluso de que chegue á retina e a luz cunha lonxitude de onda moi longa non ten enerxía abonda para estimular a retina.