Just after he accidentally increases the fire, or shoots a toy gun to Kelso, he seems to be trying hard to focus his eyes, which indicates that he suffers from some common eye problem that most aged people suffer from (presbyopia), but like many of us, he avoids wearing his glasses when he is NOT alone.
While taking a close look at the empty glass in the hand of the drunk blonde lady, he looks through his glasses, but avoids putting them on. It should indicate that he was conscious about looking 'cheap' or 'outdated' in public.
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