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10 Sep 2023, 22:07
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
82% (01:46) correct
18%
(01:54)
wrong
based on 216
sessions
History
Date
Time
Result
Not Attempted Yet
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.
Each of the following, if true, would help to resolve the apparent discrepancy in the information above EXCEPT:
(A) As the eye heals from an operation to correct nearsightedness, it may in fact overcorrect, causing the person to be farsighted.
(B) The more severe a patient’s nearsightedness, the less effective the corneal reshaping of RK will be in correcting the problem.
(C) 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.
(D) RK patients who originally suffered from only mild nearsightedness may, if the cornea does not heal evenly, develop an astigmatism that requires corrective lenses.
(E) Those who choose to undergo RK tend to be as nearsighted before this operation as those who choose not to undergo RK.
Each of the following, if true, would help to resolve the apparent discrepancy in the information above EXCEPT:
(A) As the eye heals from an operation to correct nearsightedness, it may in fact overcorrect, causing the person to be farsighted.
(B) The more severe a patient’s nearsightedness, the less effective the corneal reshaping of RK will be in correcting the problem.
(C) 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.
(D) RK patients who originally suffered from only mild nearsightedness may, if the cornea does not heal evenly, develop an astigmatism that requires corrective lenses.
(E) Those who choose to undergo RK tend to be as nearsighted before this operation as those who choose not to undergo RK.
(E) makes an irrelevant comparison between patients who choose RK and those who do not choose RK, which has nothing to do with the results of the operation. This is the correct answer.
14 Sep 2023, 10:32
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(A) As the eye heals from an operation to correct nearsightedness, it may, in fact, overcorrect, causing the person to be farsighted.
- This answer choice helps resolve the discrepancy because it suggests that some patients who undergo RK may initially experience farsightedness due to overcorrection as the eye heals, which could explain why they might still need glasses or contact lenses for nearsightedness.
(B) The more severe a patient’s nearsightedness, the less effective the corneal reshaping of RK will be in correcting the problem.
- This answer choice helps resolve the discrepancy by suggesting that the effectiveness of RK is dependent on the severity of nearsightedness. This could explain why some patients with severe nearsightedness might still need glasses or contact lenses after RK.
(C) 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 answer choice helps resolve the discrepancy because it suggests that differences in the way RK patients' eyes heal could lead to variations in visual acuity between the eyes, necessitating corrective lenses.
(D) 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 answer choice helps resolve the discrepancy by indicating that even patients with mild nearsightedness may develop astigmatism if the cornea doesn't heal evenly after RK, which would require corrective lenses.
(E) Those who choose to undergo RK tend to be as nearsighted before this operation as those who choose not to undergo RK.
- This answer choice does not help resolve the discrepancy. While it provides a comparison between the nearsightedness of patients who undergo RK and those who do not, it doesn't offer any specific information about why some RK patients might still need glasses or contact lenses after the surgery. It doesn't address the issue at the heart of the discrepancy.
To clarify, answer choice (E) is the correct answer because it does not provide any information that directly helps to resolve the apparent discrepancy in the information provided.
- This answer choice helps resolve the discrepancy because it suggests that some patients who undergo RK may initially experience farsightedness due to overcorrection as the eye heals, which could explain why they might still need glasses or contact lenses for nearsightedness.
(B) The more severe a patient’s nearsightedness, the less effective the corneal reshaping of RK will be in correcting the problem.
- This answer choice helps resolve the discrepancy by suggesting that the effectiveness of RK is dependent on the severity of nearsightedness. This could explain why some patients with severe nearsightedness might still need glasses or contact lenses after RK.
(C) 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 answer choice helps resolve the discrepancy because it suggests that differences in the way RK patients' eyes heal could lead to variations in visual acuity between the eyes, necessitating corrective lenses.
(D) 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 answer choice helps resolve the discrepancy by indicating that even patients with mild nearsightedness may develop astigmatism if the cornea doesn't heal evenly after RK, which would require corrective lenses.
(E) Those who choose to undergo RK tend to be as nearsighted before this operation as those who choose not to undergo RK.
- This answer choice does not help resolve the discrepancy. While it provides a comparison between the nearsightedness of patients who undergo RK and those who do not, it doesn't offer any specific information about why some RK patients might still need glasses or contact lenses after the surgery. It doesn't address the issue at the heart of the discrepancy.
To clarify, answer choice (E) is the correct answer because it does not provide any information that directly helps to resolve the apparent discrepancy in the information provided.
23 Jun 2025, 05:19
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