Question

Cornea transplantation is successful as cornea is
A. Easily available
B. Without blood supply
C. Easily preserved
D. Easily stitched

Answer 1

Hint: The transparent part of the eye that covers the front portion of the eye is called cornea. The pupil, iris, and anterior chamber is covered by cornea. The main function of the cornea is to refract or bend light. Focusing most of the light that enters the eye is done by cornea. The refractive power of the cornea in humans is approximately \[43\] diopters. Surgical procedures such as LASIK can reshape cornea.

Complete answer:
Option A Easily available: Easy availability is a main factor for any kind of organ transplantation. But past studies show that there is a considerable shortage of corneal graft tissues in which only \[1\] cornea is available for \[70\] needed. This suggests that cornea is not easily available.
Hence option A is incorrect.
Option B Without blood supply: Cornea is the only human part where there is no blood supply. Cornea can absorb oxygen directly from the air. This is the main reason by which the transplantation of cornea is more successful. Cornea transplantation is also called keratoplasty. This procedure has a very less chance of rejection by the immune system.
Hence option B is correct.
Option C Easily preserved: The FDA has approved the use of solutions to preserve donated corneas for up to \[14\] days before transplantation. However, surgeons generally prefer not to use corneas that are stored for more than seven days. Hence longer preservation is not easy.
So, option C is incorrect.
Option D Easily stitched: The transplantation is a very delicate process and is stitched under a microscope using stitches thinner than a hair. It is a difficult process.
Hence option D is incorrect.

Hence, Option B. Without blood supply is the correct answer.

Note:
There is risk of infection in cornea transplantation. The cornea heals much more slowly than a cut on the skin, since the cornea does not have blood vessels. It is possible that the cornea might become infected by various microorganisms, while the wound is healing. By taking antibiotic prophylaxis, this risk can be reduced. There is also a risk of cornea rejection which occurs in about \[10\% \] of the cases.