Final answer:
Pilocarpine is used intraoperatively for pupillary constriction during laser iridectomy, and specific techniques or agents support the position of an implanted lens after cataract extraction, unmentioned in the provided content. An intraocular lens's power is adjusted based on the patient's previous vision condition.
Step-by-step explanation:
During intraoperative procedures, specifically during laser iridectomy, pilocarpine may be used for pupillary constriction. Pilocarpine is a muscarinic agonist that induces the smooth muscle of the iris to constrict, thereby reducing pupil size. On the other hand, after a cataract extraction, to maintain the position of an implanted lens, which provides perfect distant vision, certain postoperative care and potentially additional medical supports may be necessary, although the specific agents or methods used to maintain the position are not detailed in the provided information. If a person was nearsighted before the surgery, the power of the intraocular lens implanted would be less than the power of the removed lens to correct the nearsightedness. Finally, to correct myopia by reshaping the cornea, the curvature must be made smaller, whereas hyperopia correction involves increasing the curvature of the cornea.