The main function of the cornea present in the human eye is

The correct option is: "bends light before it reaches the lens".

The cornea is the clear, dome-shaped outer layer at the front of the eye. Its primary function is to act as the eye's outermost lens, functioning as a window that controls and focuses the entry of light into the eye.
When light strikes the cornea, it bends (refracts) the incoming light rays. This bending is the initial and most significant step in focusing light. The cornea accounts for approximately 65% to 75% of the eye's total focusing power.
After the light is bent by the cornea, it passes through the pupil and the crystalline lens, which further fine-tunes the focus onto the retina at the back of the eye to form a sharp image.