It is probably worth considering this point (and writing as a physicist, I pose the question to eye care practitioners reading this article) - if a person presents with an unaided vision of less than 6/18 in their better eye which is correctable to 6/6, would you not correct them?
Rather than go into the somewhat 'political' definitions which can arise in such a debate, it seems perhaps better when making an estimate of global need to adopt a simple approach and to postulate that people need distance vision correction if their unaided distance vision acuity is worse than 6/6 in the better eye, and that they also need vision correction if they are presbyopic.
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