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Chapter 24: Q22CQ (page 886)

Laser vision correction often uses an excimer laser that produces electromagnetic radiation. This wavelength is extremely strongly absorbed by the cornea and ablates it in a manner that reshapes the cornea to correct vision defects. Explain how the strong absorption helps concentrate the energy in a thin layer and thus give greater accuracy in shaping the cornea. Also, explain how this strong absorption limits damage to the lens and retina of the eye.

Short Answer

Expert verified

A rise in temperature that vaporizes the cornea aids in cornea reshaping.

Step by step solution

01

Define wavelength

The wavelength of a wave is defined as the distance between two identical locations in two consecutive waves.

02

Explanation

When a limited number of photons are aimed at the eye's lens, they are absorbed and concentrated in a thin layer. These focused photons boost the temperature of the cornea, causing some of it to vaporize and the space produced by this to be filled by corneal tissue, resulting in corneal reshaping. Because of this absorption, the laser is absorbed by the cornea, leaving the lens and retina unharmed.

Therefore, a rise in temperature that vaporizes the cornea aids in cornea reshaping.

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