Most of us have seen a cat’s eyes shining at us in the dark as we drive by.  The cat’s eyes themselves do not glow.  The glow is only a reflection of the cat’s headlights.

A cat has an extra mirror like material in the back part of its eyes.  This special material reflects direct light and causes the cat’s eyes to “glow”  brightly.

A cat’s eyes have slit like pupils.  In bright light the pupils become narrow slits that shut out much of the glare.

At night they widen to great circles to let in all the light there is.  But even a cat cannot see in total darkness, as some people think.

Many animals active at night, such as deer and raccoons, have this mirror like material in their eyes, too. – Dick Rogers