Do plus lenses cancel out minus lenses? For example, is wearing +1.50 reading glasses over -5.00 contact lenses the same as wearing -3.50?
Pretty much, yes. That is why nearsighted people often grow dissatisfied with their vision from contacts as they reach their presbyopic middle age years. They find their near vision stays quite good (when not wearing glasses or contacts full time) but now they have to wear both glasses (for reading)...
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22 Feb 2022