B. astigmatism is the best answer, it definitely gives distorted images.
Nearsightedness is where you can't see things clearly unless they are really close up to the eyes. Farsightedness is where you can see things better the farther off, but both of those may still leave you seeing blurry. Sclera is just part of they eyeball, the outer white layer.
It is true that according to statistics, half of all American teens will experiment with illegal drugs before they graduate high school. Teens are especially susceptible to bad influences, and wanting to be cool around their friends, they will often try various types of drugs during their high school years. Unfortunately, the number of such children is very large, but it doesn't happen in America only, but all over the world.
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