In eye donation, which one of the following parts of donor's eye is utilised?

1. Eye donation involves the voluntary pledging of eyes after death for transplantation or research. 2. The part of the donor's eye that is primarily used for transplantation to restore vision in recipients with corneal blindness is the Cornea. 3. The Cornea is the transparent outer layer at the front of the eye that covers the iris, pupil, and anterior chamber. Its clarity is essential for focusing light onto the retina. 4. The iris (controls pupil size), lens (focuses light), and retina (contains light-sensitive cells) are generally not transplanted in standard eye donation procedures aimed at treating corneal blindness, although other parts might be used for research or other specific therapeutic purposes.