Yesterday, my girl friend, her mother and I went to "optical 88"(hong kong optical chain store) to buy a reading glasses. I have seen a term progressive lens. Could anyone explain how it work to correct the short sight and long sight. I knew this technique may have 2-3 years history. I'm not sure. I wonder whether it's effective in correcting the short and long sight.
(p.s. I spent around HKD 2,xxx yesterday. Today, I havent taken my lunch so as to save my money for tommorrow
. Quite Hungry now.)
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