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An excimer laser is a specialized ultraviolet laser used in refractive surgery (like LASIK and PRK). It is characterized by its high precision, as it can remove microscopic layers of corneal tissue without damaging the surrounding cells.
read more about excimer laser ...The primary mechanism of action is photoablation. The laser emits a cold, high-energy beam of ultraviolet light that breaks the molecular bonds of the corneal tissue. The laser removes tissue without creating heat, which prevents thermal damage and scarring on the surrounding cells. This precision allows surgeons to reshape the cornea to correct vision.
Laser technology reshapes the cornea by removing tissue in a controlled, predetermined pattern. For nearsightedness, the center of the cornea is flattened. For farsightedness, the periphery is treated to steepen the center. The pattern is guided by complex computer algorithms based on the patient's prescription and corneal map.
The Excimer laser is the necessary tool for performing LASIK and PRK. It vaporizes corneal tissue to correct refractive errors (myopia, hyperopia, and astigmatism), eliminating the need for glasses or contact lenses.
Precision and tracking are necessary to ensure safety and accuracy. The laser is guided by an eye-tracking system that monitors the eye's involuntary movements during the procedure. If the eye moves, the laser stops instantly, ensuring the ablation pattern remains perfectly centered.
The post-surgical results are generally excellent, providing significantly clearer vision quickly. Patients trade the daily routine of lens wear for a surgical procedure that offers long-term vision correction.
No, the excimer laser uses high-energy ultraviolet light, often referred to as a "cold laser," because it ablates tissue without creating heat.
The actual laser application usually takes less than one minute per eye.
The prescription must be within a certain range. Very high prescriptions may be limited by the thickness of the cornea.
If you are considering LASIK or PRK, a doctor must measure your "Corneal Pachymetry" (thickness). If the excimer laser removes too much tissue, it can lead to "Keratectasia", a dangerous bulging of the eye. A thorough pre-operative screening is a medical necessity for a safe outcome.
AAO. Excimer Lasers in Ophthalmology (aao.org). 2024.
FDA. LASIK: Risks and Benefits (fda.gov). 2024.
Mayo Clinic. LASIK Surgery (mayoclinic.org). 2024.
ASCRS. Refractive Surgery Standards (ascrs.org). 2024.