What does it mean when a guy takes off his glasses when he sees you?

I’ve noticed some guys or my guy friends would take off their glasses when they see me and most of them keep it on around they’re friends but it comes to me they take it off right away when they see me even if it’s for a few seconds and put it back on again? Are they insecure of they’re looks because of me?
What does it mean when a guy takes off his glasses when he sees you?
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