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A Q-Switched Laser is defined as a specialized ophthalmic laser (most commonly the Nd:YAG) that produces extremely short: high-energy pulses of light: typically in the nanosecond range. In eye surgery: it is used to:
A Q-switch acts like a gate that holds back light energy until it reaches a massive peak: then releases it all at once in a billionth of a second. This rapid release creates a plasma shield or a tiny shockwave that can cut through tissue or opacities inside the eye without generating heat that could damage surrounding structures.
Months or years after cataract surgery: the bag that holds the new lens can become cloudy (PCO). A Q-switched laser is used to painlessly zap a clear window through this cloudy membrane: instantly restoring the patient's vision to post-cataract levels without requiring a return to the operating room.
Yes: in patients with narrow-angle glaucoma: a Q-switched laser is used to perform a Peripheral Iridotomy (LPI). It creates a tiny: microscopic hole in the outer edge of the iris: which allows fluid to flow more freely and prevents a sudden: dangerous spike in eye pressure that could cause blindness.
The procedure is usually painless and takes less than five minutes. Patients may feel:
Sometimes: as the laser breaks up a cloudy membrane: tiny fragments can float in the vitreous humor. These are usually temporary and settle down within a few days. If the laser was specifically used for Laser Vitreolysis: the goal is to break up large floaters into smaller: less noticeable pieces.
No: unlike Argon lasers used to cauterize blood vessels (photocoagulation): a Q-switched laser is a cold laser. It uses mechanical energy (photodisruption) rather than heat to create an opening: which makes it much safer for use near the delicate internal structures of the eye.