Explanation
The author has “damaged” eyes, and any word that fills the blank must reflect that fact. The words that best do so are “deteriorate” and “decline” (Choices A and D), which generate sentences alike in meaning. “Sharpen” and “improve” produce sentences alike in meaning, but neither word makes sense when inserted into the blank. Though “adjust” makes some sense when inserted into the blank, no other option produces a sentence similar in meaning.
Thus the correct answer is deteriorate (Choice A) and decline (Choice D).
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