I have a customer that purchased a pair of flat-top 28 when he looks straight above line in his distance RX he see's fine, but if he looks up not moving his head he gets a double vision. I have matched OC and base curves had him re-checked. I checked for waves in lens, what am I forgetting? Could this be a medical issue and not fixable with a RX. I had him take glasses off and without he gets a little but not as much as he does with the glasses. What am I missing, driving me nuts...
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