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# Nonprescription sunglasses shield the wearer's eyes from dam

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Nonprescription sunglasses shield the wearer's eyes from dam [#permalink]  20 Feb 2019, 05:22
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Nonprescription sunglasses shield the wearer's eyes from damaging ultraviolet sunlight. Squinting, however, provides protection from ultraviolet rays that is at least as good as the protection from nonprescription sunglasses. There is, therefore; no health advantage to be gained by wearing nonprescription sunglasses rather than squinting.

Which of the following, if true, most seriously weakens support for the conclusion above?

(A) Many opticians offer prescription sunglasses that not only screen out ultraviolet sunlight but also provide corrective vision.
(B) Some nonprescription sunglasses provide less protection from ultraviolet sunlight than does squinting.
(C) Squinting strains facial muscles and causes headaches and fatigue.
(D) Many people buy sunglasses because they feel that sunglasses are fashionable.
(E) Some people squint even when they are wearing sunglasses.
[Reveal] Spoiler: OA

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Re: Nonprescription sunglasses shield the wearer's eyes from dam [#permalink]  01 Mar 2019, 19:56
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(A) The argument is only concerned with shielding from ultraviolet rays. Corrective vision is irrelevant.

(B) This might even strengthen the conclusion by saying that squinting is even better than nonprescription sunglasses. But it only deals with some nonprescription sunglasses, so the scope is not big enough to consider.

(C) This is a good weakener. Yes, squinting reducing exposure to ultraviolet rays, but it also has other health disadvantages. Therefore, wearing sunglasses is more beneficial.

(D) The conclusion is about health, not fashion.

(E) Again this only deals with some people, so it can't weaken the conclusion for all people. It doesn't weaken the conclusion anyways, though, because it doesn't say anything about health advantages.
Re: Nonprescription sunglasses shield the wearer's eyes from dam   [#permalink] 01 Mar 2019, 19:56
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# Nonprescription sunglasses shield the wearer's eyes from dam

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