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I've read from various link that to measure power/dioptre of eye glasses lens, we need to put far point into equation for nearsightedness and near point for farsightedness.

The problem is I cant find the standard procedure to measure those values. Can I just put a letter on the wall and walk away step by step until its blurry to measure far point and hold a paper in my hand with a letter and push it away until its clear to see for measuring farsightedness?

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