Through body language, people communicate in many effective, non-verbal ways. Add an accessory into the mix and it gets better. Since a lot of emotion rides on a person's face, what better accessory is there than thick-rimmed spectacles or a spiffy pair of shades?
The Glasses Come Off - A device used by a character to heighten the intensity or seriousness of a situation, to further initiate an intimate scene, or to let the audience know that someone's about to get their butt kicked.
Want your character to be an intellectual (or give your audience or other characters that notion)? Slap one of these on him! Whether they can see fine without or not is up to you. But when they come off - that's when the fireworks happen!
When someone cries for help, what's the first thing Clark Kent does before heading to the nearest phone booth?
Superman's coming for you, Mr. Luthor!
When's Superman's done saving the day, he checks on Miss Lane, but those glasses can sure get in the way!
But why all the dramatics? So a character takes their glasses off. So what? For one thing, good glasses aren't cheap. It makes sense to take them off before getting into a situation that could scuff or damage them. Or get them lost. Or steam them up. You get the idea.
On rare occasions, putting glasses on might stir the hornets' nest (in Mr. Hunt's case, reveal the bad guy).
Others are doomed to wear glasses forever. If they take them off, they could very well blow up your house.
When a character doesn't take a situation or a line of dialogue seriously, they might give a Partial Removal.
And if the glasses never come off? That means the character is too cool or too tough to be bothered.
This trope is literally everywhere. Glasses are masks. Take them off and you reveal the eyes, the window to the soul. Maybe that's why taking glasses off is a more sleek and intimidating gesture than taking off a hat or jacket. The look in a character's eye dictates the rest.
Ever write a character with glasses? Did they take them off? The beginning of something or a casual gesture?
I'm David, and I'm taking my glasses off now!