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Solved: Laser vision correction often uses an excimer
Chapter 24, Problem 22(choose chapter or problem)
Problem 22CQ
Laser vision correction often uses an excimer laser that produces 193-nm 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.
Questions & Answers
QUESTION:
Problem 22CQ
Laser vision correction often uses an excimer laser that produces 193-nm 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.
ANSWER:
Solution 22CQ
A small number of photons of a particular wavelength are projected towards lens of the eye. These photons are strongly absorbed before getting absorbed and gets concentrated to a thin layer.