How can a crocodile see under water?

Natalie Ireland, on March 11, 2008 at 12:23 pm said:

Crocodiles are able to see under water because they have an extra, transparent eyelid on each eye that closes over their eyes when they are underwater. They also have specialised retina (cells at the back of the eye) that enable them to see really well in the dark.
Paul Burgess, on June 2, 2017 at 1:28 pm said:

Many animals that live under water have perfect vision under water and poor vision out of it in a similar but opposite way to us. We see perfectly in air but poorly in water. Essentially the eye is a photographic plate that differs little between species except for in one regard. Light that enters any eye is regracted (bent) by the cornea, lense and the various liquids in the eye- vitreous and aqueous humour. The refracting materials are designed to focus the image on the retina of the eye perfectly. What makes this difficult is the medium the light has been travelling through before reaching the eye. The human eye is designed to bend light that has reached our eye through air, giving us a perfect image. However, if the light travels through water, the bending power of the hummer eye is not correct for focus onto the retina. So to answer the question, since the main adjustable aspect of vision is the shape of the lens, a crocodile must have evolved a much greater lens adjustment that we have enabling it to see both on land and in water

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