Question
These days, a variety of eye surgeries including cataract surgeries are performed using lasers, with small incisions and fewer postoperative complications and early recovery. What is the pulse duration of laser used in cataract surgery as shown below?
| A. |
10 -15 seconds
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| B. |
10 -12 seconds
|
| C. |
10 -8 seconds
|
| D. |
10 -6 seconds
|
Show Answer
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Correct Answer � A
Explanation
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|
Ans: A. 10 -15 seconds
(Ref: Parsons 22/e p606, 21/e p584).
- In the given image for cataract surgery, Femtosecond laser is used.
- The pulse duration of femtosecond laser is 10-13 seconds.
Femtosecond (FS) laser:
- An infrared laser with a wavelength of 1053 nm.
- FS laser is like Nd: YAG laser.
MOA:
- Works by producing photodisruption or photoionization of optically transparent tissue (cornea). Application of either FS laser or Nd: YAG laser results in generation of a rapidly expanding cloud of free electrons and ionized molecules.
- Nd: YA G laser has a pulse duration in the nanosecond range (10-9 seconds).
- FS laser has pulse duration in the femtosecond range (10-15 seconds).
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