回答
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My eyesight's getting worse, and I've become farsighted. I need to get new glasses.
老眼 = farsightedness
近視 = nearsightedness
買い替え = to replace ~ ; to get a new ~
回答
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My eyesight is getting worse. It seems that I am starting to get farsighted. I have to buy new glasses.
「視力も落ちてきたし、老眼も始まったようだ。眼鏡を買い替えないと。」- 'My eyesight is getting worse. It seems that I am starting to get farsighted. I have to buy new glasses.'
「老眼」は 'farsightedness' か 'age-related farsightedness' とも言えます。(年齢に関係ない farsightedness は 遠視 です。)