Radial keratotomy (RK), a surgery that is designed to reshape the cornea so that light focuses correctly on the retina, is supposed to make eyeglasses or contact lenses that correct for nearsightedness unnecessary. ███ █ █████ ██ ████████ ███ ████ █████████ ██ █████ ████ ████ ██ ████ █████ ████ ██ ████ ███████ ██ ███████ ███████
Some patients wear glasses or contacts after receiving RK surgery, which is meant to make them unnecessary.
The correct answer must fail to explain why some RK patients need glasses or contacts after receiving surgery. Every wrong answer, meanwhile, will state a difference between the intentions of RK surgery and its actual effect on some patients that results in those patients wearing glasses or contacts afterward.
Each of the following, if █████ █████ ████ ██ ███████ ███ ████████ ███████████ ██ ███ ███████████ █████ ███████
As the eye █████ ████ ██ █████████ ██ ███████ ████████████████ ██ ███ ██ ████ ████████████ ███████ ███ ██████ ██ ██ ███████████
This would make glasses or contacts necessary for some RK patients. An overcorrecting eye would necessitate glasses or contacts to correct the new problem caused by the surgery.
The more severe █ █████████ ████████████████ ███ ████ █████████ ███ ███████ █████████ ██ ██ ████ ██ ██ ██████████ ███ ████████
This implies that very nearsighted patients may not have their vision completely corrected by RK surgery, which would make eyeglasses or contacts necessary afterward.
Occasionally an RK █████████ ████ ███ ████ ████████████ ███████ █ ██████████ ██ ███ ███ █████ ██████ ██████ ████ ███ ██ ████████ ████ ████ ██████████ ███████
This would explain why some RK patients require glasses or contacts. If their eyes heal differently, the surgery will cause a new problem that glasses or contacts can fix.
RK patients who ██████████ ████████ ████ ████ ████ ███████████████ ████ ██ ███ ██████ ████ ███ ████ ███████ ███████ ██ ███████████ ████ ████████ ██████████ ███████
This would explain why some RK patients require glasses or contacts. If they develop an astigmatism, glasses or contacts may be necessary to correct a new problem caused by the surgery.
Those who choose ██ ███████ ██ ████ ██ ██ ██ ███████████ ██████ ████ █████████ ██ █████ ███ ██████ ███ ██ ███████ ███
This does not explain why RK patients would need glasses or contacts after surgery. It refers only to patients before they receive the surgery, not the consequences of the surgery.