The passage goes like : excessive phone usage --> increase in intraocular pressure --> vision impairment.
We need a question that strengthen or weakens this link.
A) passage is not talking about the final intraocular pressure but the increase of it. So this doesn't strengthen or weaken.
B) Correct : this seems to show some effect on the second link which is between intraocular pressure and vision impairment.
C) This adds extra info but doesn't target the links above.
D) This option attacks on the no. of hours but not the relation between phone usage and increase in pressure.
E) This does same mistake as option-C. it says vision impairments happens from other factors too. But that doesn't negate the fact that it happens with intraocular pressure.
BunuelIn a study, researchers repeatedly measured the intraocular pressure of thousands of teenage volunteers over four years. The researchers found that intraocular pressure increased more quickly in teenagers who used screens for more than six hours per day. Since elevated intraocular pressure is associated with vision impairment, the researchers concluded that heavy daily screen use contributes to vision impairment.
In order to assess the force of the researchers' evidence for their conclusion, it would be most helpful to know whether
(A) among volunteers whose intraocular pressure was highest at the end of the study, most had already had elevated readings at the start
(B) intraocular pressure is a reliable indicator of overall visual system health compared with other eye measurements
(C) any other habits common among teenagers who use screens for more than six hours per day also tend to cause intraocular pressure to increase more quickly
(D) any of the volunteers whose intraocular pressure increased during the study used screens for fewer than six hours per day
(E) vision impairment can result from factors that do not involve elevated intraocular pressure
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