They do not require tears either, since their eyes are bathed by water, no special lubricant like tears is required. Back To Top 14 . Some of them have rudimentary eyes with permanently closed eyelids over them, while in some the eyes are totally absent. Back To Top 15 . Man is known by the company he keeps.
Color is sensed by the cones in the retina .
The color of the surrounding affects the perception of color.