My guess is that it's a pretty simple test in an optical shop. Now that laser pointers are dollar store items, there's probably a cheap but accurate do-it-yourself method, too. I don't have the time right now to google any of this. We have optical professionals who post here; maybe one of them will comment. --~--~---------~--~----~------------~-------~--~----~ Check us out at the oft-updated http://glassyeyes.blogspot.com!
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