The *lens* is inches from your eyes. The lens does the same thing glasses do, but backwards, to make the nearby screen appear far away so that your eyes are able to focus on it.
Problem is, your eyes struggle to focus on far off objects, and have an easier time with nearby objects, so you need *another* lens to make up for it. If you removed both lenses and looked directly at the screen, it would be in focus (if you’re nearsighted enough).
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