Background Paragraph: Nearsightedness, or myopia, is the condition in which nearby objects are seen clearly, but distant objects appear blurry. The Figure below shows how it occurs. The eyeball is longer (from front to back) than normal. This causes images to be focused in front of the retina instead of on the retina. Myopia can be corrected with concave lenses. The lenses focus images farther back in the eye, so they fall on the retina instead of in front of it. 
Story: John and Keith are two friends. They went to see an ophthalmologist for an eye cheek up. The doctor found that John had myopia, but Keith had normal eyes. He advised them according to his findings.
Who would most likely need concave lenses, John or Keith? Who would most likely not need concave lenses, John or Keith? Who would see distant objects less clearly, John or Keith? Who would see distant objects more clearly, John or Keith? Whose eyeball would be longer than normal, John or Keith? Whose eyeball would not be longer than normal, John or Keith? Would John see distance objects more clearly or less clearly than Keith? Would John's eyeball more likely or less likely be longer than Keith's? Would Keith see distance objects more clearly or less clearly than John? Would Keith's eyeball more likely or less likely be longer than John's?