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The following factors help in maintaining corneal transparency EXCEPT:

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Final answer:

The factors that help in maintaining corneal transparency include smaller refractive indices, refraction of rays away from the central axis, iris adjustment, and the protective layer of the cornea. The thickness of the cornea is not a factor in maintaining corneal transparency.

Step-by-step explanation:

The factors that help in maintaining corneal transparency include:

  1. The cornea, aqueous humor, and lens of the eye have smaller refractive indices than air.
  2. Rays entering the eye are refracted away from the central axis, which causes them to meet at the focal point on the retina.
  3. The iris adjusts the amount of light coming into the eye.
  4. The cornea is a protective layer on the front of the eye.
  5. The thickness of the cornea allows for precise vision correction in LASIK surgery.

Therefore, the factor that does not help in maintaining corneal transparency is the thickness of the cornea which is relevant in LASIK surgery.

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