Final answer:
True, LASIK or PRK are procedures used to adjust a patient's vision, often achieving normal distant vision in more than 90% of cases.
Step-by-step explanation:
The statement that LASIK or PRK is a procedure to adjust the patient's vision is true. Both LASIK (Laser-Assisted in situ Keratomileusis) and PRK (Photorefractive Keratectomy) are laser vision correction procedures that reshape the cornea using an excimer laser. In LASIK, the top layer of the cornea is temporarily peeled back before the underlying tissue is ablated to correct the eye's focus. This process is highly accurate, thanks to computer-controlled laser ablations, and can correct nearsightedness, farsightedness, and astigmatism. In most cases, over 90% of patients achieve normal distant vision following the procedure.