LSAT 108 – Section 3 – Question 17

LSAT 108 - Section 3 - Question 17

February 2000

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Question QuickView	Type	Tags	Answer Choices	Curve	Question Difficulty	Psg/Game/S Difficulty	Explanation
PT108 S3 Q17	+LR	Except +Exc Resolve reconcile or explain +RRE	A 3% 159 B 3% 162 C 1% 153 D 1% 155 E 92% 167	126 138 149	+Easier	147.273 +SubsectionMedium

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. Yet a study of patients who have undergone RK shows that some of them still need to wear glasses or contact lenses.

"Surprising" Phenomenon

Some patients wear glasses or contacts after receiving RK surgery, which is meant to make them unnecessary.

Objective

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.

As the eye heals from an operation to correct nearsightedness, it may in fact overcorrect, causing the person to be farsighted.

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 a patient’s nearsightedness, the less effective the corneal reshaping of RK will be in correcting the problem.

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 patient’s eyes may heal differently, causing a difference in the two eyes’ visual acuity that can be overcome only with corrective lenses.

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 originally suffered from only mild nearsightedness may, if the cornea does not heal evenly, develop an astigmatism that requires corrective lenses.

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 to undergo RK tend to be as nearsighted before this operation as those who choose not to undergo RK.

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.

LSAT 108 – Section 3 – Question 17

LSAT 108 - Section 3 - Question 17

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LSAT PrepTest 108 Explanations

Section 1 - Reading Comprehension

Section 2 - Logical Reasoning

Section 3 - Logical Reasoning

Section 4 - Reading Comprehension

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