People with a certain eye disorder are virtually unable to see in mode

Question

People with a certain eye disorder are virtually unable to see in moderately bright light, which seems to them unbearably intense, since the cells of their retinas are overwhelmed by moderately bright light. These people do, however, show normal sensitivity to most components of dim light. Their retinal cells are also not excessively sensitive to red components of moderately bright light.

The information above best supports which of the following hypotheses about people who have the disorder described and who have no other serious visual problems?

The information above best supports which of the following hypotheses about people who have the disorder described and who have no other serious visual problems?

A. They typically see more acutely at night and in dim light than do people who do not have the disorder.
B. They react to extremely bright light in much the same way that people without the disorder do.
C. In an otherwise darkened concert hall, they will see a dimly illuminated red exit sign more clearly than people without the disorder will.
D. The biological mechanism by which they perceive the color red is different from the mechanism of people who do not have the disorder.
E. Eyeglasses that are transparent to red components of light but filter out other components of light will help them see in moderately bright light.

Bunuel · Answer

Above is slightly reworded version of the following old GMAT Prep question: https://gmatclub.com/forum/people-with- ... fl=similar

medicaldevicegirl · Answer

We can rule out A and C because “These people do, however, show normal sensitivity to most components of dim light”
B is out of scope, we have no info about their reaction to extremely bright light in the passage.
D seems appealing at first, but recall that *only* red light at moderate brightness doesn’t trigger the reaction- meaning that their response to red light is the same as everyone else, and other colors of light are responsible for the reaction. 
That leads us to E, the correct answer, for the same reason that D is not correct- red is the only light that can be tolerated at moderate brightness.

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GMATmona07 · Answer

IMO the official answer E is wrong for this argument & E is more like a strengthener.
I think D is an inference that can be drawn based on the information given in the argument.

AjiteshArun   GMATNinja   GMATGuruNY   VeritasPrepBrian  @MartyMurray  DmitryFarber  @IanStewart@AndrewN
Experts please shade some light on this.

Thanks

AjiteshArun · Answer

Hi GMATmona07,

Have a look at this part of the argument:
 
If their cells aren't excessively sensitive to red, it's possible that their cells are  normal  as far as red is concerned (it's also possible that their cells are less sensitive, but we wouldn't normally use the phrase  are also not excessively sensitive  if what we really wanted to say was  less sensitive ).

If their cells are normal as far as red is concerned, we don't have a very good reason to believe that the biological mechanism by which they perceive the color red is different from the mechanism of other people. Keep in mind that option D is not about "the biological mechanism" in general. It's limited to "the biological mechanism by which they perceive the color  red ". For all we know, their cells are normal as far as red is concerned.

BottomJee · Answer

INFERNCE based question, start with eliminating choices.

We cannot hypothesize for people who do not have this disorder because argument is only concerned with people having the concerned disorder.  EIMINATE

Again we know nothing about people who do not have this disorder.
 EIMINATE

Same as A & B.
 EIMINATE

Same as A, B & C (We know nothing about the mechanism of people who do not have this disorder)
 EIMINATE

This choice focuses only on People having this disorder (It is exactly what we want) and how blocking other components of light could help them see in mod. bright light.
 Correct Answer

agrasan · Answer

A. They typically see more acutely at night and in dim light than do people who do not have the disorder.

B. They react to extremely bright light in much the same way that people without the disorder do.

C. In an otherwise darkened concert hall, they will see a dimly illuminated red exit sign more clearly than people without the disorder will.

D. The biological mechanism by which they perceive the color red is different from the mechanism of people who do not have the disorder.

(A), (B), (C), (D)  cannot be hypothesis  as we are not given any info how people without that disorder perform, hence, this hypothesis of comparison is not supported.

E. Eyeglasses that are transparent to red components of light but filter out other components of light will help them see in moderately bright light.
Yes, it  can be a hypothesis , we are given that people with disorder don't react abnormally to red component of light, thus, if they put eyeglasses which can filter other components of light except red then they will be able to see properly.

People with a certain eye disorder are virtually unable to see in mode

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People with a certain eye disorder are virtually unable to see in mode

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