Which laser type is primarily used for procedures like PRK and LASIK?

• A. Nd:YAG
• B. Carbon Dioxide (CO²)
• C. Excimer or halide
• D. Helium-Neon

Answer: (C)

The excimer laser, often referred to as either an excimer or halide laser, is specifically designed for applications such as PRK (photorefractive keratectomy) and LASIK (laser-assisted in situ keratomileusis). These procedures involve reshaping the cornea to correct refractive errors in vision, such as myopia, hyperopia, and astigmatism.

Excimer lasers emit ultraviolet light in very short pulses, allowing for the precise ablation of corneal tissue without damaging surrounding areas. This precision is crucial in refractive surgery, as it minimizes the risk to adjacent ocular tissues and ensures a smooth, even curvature of the cornea, which is essential for achieving the desired visual outcomes. The use of ultraviolet light also allows for minimal thermal damage, reducing complications during the healing process.

In contrast, the other laser types listed serve different medical purposes. For example, the Nd:YAG laser is primarily used for procedures like capsulotomy and laser lithotripsy, but it is not suitable for refractive eye surgeries. The Carbon Dioxide laser is commonly employed in surgical procedures to cut or vaporize soft tissues, while the Helium-Neon laser, mainly utilized for low-power applications like laser pointers and