Yes, the correction should be the combination of the subject's own lens in their eye plus the specs - however, this is only true when they are aligned properly. How about if the laser beam enters from an angle? I've known people whose lenses look like massive magnifying glasses, so much so that they have to take extra care not to get burnt around their eyes on a sunny day!
(incidentally, long sighted people often only need specs for reading and will not be wearing then at an event anyway - but how about bifocals? Also, long sight largely affects people over 50 - what's the average age of a lasershow audience?) Perhaps signage needs to include something to warn longsighted people to remove their eyewear?


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