Usage of "Instill Yourself"

[Jraou]

Hi again,
Here are a couple of situational questions. I'll be really thankful if you give me the proper terms:
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1. What is the expression to ask about the amount of weakness(far-saightedness or near-sightedness) in one's eyes?
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2. What is it called when something is wrong but you try to believe it's right. Can we say you instill yourself that it's right?
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[Yankee]