Bob wears glasses, and Alice does not. One day, she asks him, "Can I borrow/see/try (or try on)/wear your glasses?" He gives them to her, and she'll likely comment on either how bad his vision is or how cute/smart she feels/looks (or both). Another common scenario is Alice just randomly yanking them off his face and putting them on.
There are a few reasons a character might want to wear another's glasses. As stated above, they may want to look "cool" or "smart". Similarly, they may just be curious if they've never worn glasses themselves. Another, more practical, reason is that they're having trouble seeing something far away or reading something, and might need glasses of their own. When a bully does this, it's usually to mock their victim, especially if said bully is engaging in a game of Keep Away.
Asking to try on someone else's glasses could be a way of flirting with them. Most of the time, when somebody (real or fictional) snatches the glasses off of someone's face without asking first, they come off as rude and are demonstrating their inability to grasp the basic concept of personal space.
A less common situation is when a character who already wears glasses wants to swap specs with another to see who has the stronger/weaker prescription.
Truth in Television, as many glasses wearers can attest to. This behavior typically starts during infancy and lasts all through grade school, usually (but not always) tapering off during or after college, when people begin to realize how awkward and frankly bizarre it is to just take people's glasses off their faces. People doing this are normally trying to invoke Meganekko, Sexy Spectacles, and/or some combination of Nerd Glasses and Smart People Wear Glasses. It can also be a direct result or consequence of Hold My Glasses. Depending on the style of glasses, this could easily veer into Making a Spectacle of Yourself territory. Related to Blind Without 'Em and Dropped Glasses and very similar to Purely Aesthetic Glasses.
- My Hero Academia: During the dorm room contest it's revealed Iida has a full shelve of spare glasses he treats as completely normal, much to Uraraka's amusement. It's not directly addressed, but attentive viewers may notice that for the rest of the competition, both Uraraka and Mina now each wear a pair of Iida's glasses.
- In the Ranma vs. Predator crossover fanfic by Jason Wages, Shampoo picks up Mousse's clothes (after the latter is turned into a duck) and gets curious about his coke-bottle glasses, trying them on. The extreme prescription disorients her at first, but it proves an incredible stroke of luck because the glasses' distortion happens to be exactly what's needed to cancel out the Predator's Invisibility Cloak, sparing Shampoo from being caught by surprise.
- Atlantis: The Lost Empire: As shown in the page image, Kida takes and wears Milo's glasses while showing him around Atlantis for the first time due to never having seen the object until now.
- Adventures in Babysitting: Brenda makes the mistake of taking her glasses off and putting them in the chair next to her to take a quick nap while in the bus station. A homeless woman walks up, takes the glasses, puts them on and finds her vision improved (which likely wouldn't happen in real life), and walks off.
- Captain America: Civil War: When Tony Stark tries to recruit Peter Parker, the former briefly tries looking out of the goggles in the latter's Cheap Costume.
Tony: Lordy, can you even see in these? Aah, I'm blind!
- Harry Potter and the Deathly Hallows: Part 1: Six other characters have to turn into Harry and consequently also have to wear his glasses. Hermione puts on a pair of Harry's glasses before transforming. Once she sees how much they adjust her eyesight, she criticizes his.
- Brooklyn Nine-Nine: In one episode, Santiago has to start using back-up glasses after her contacts dry out due to being forced to spend 48 hours in the precinct. Peralta snatches them off her face and wears them for a few seconds, which he soon regrets.
Peralta: You're a blind cop! How has there not been a made-for-TV movie about your struggles?
- Girl Meets World: As part of the makeover Smackle requests in "Girl Meets Smackle," Riley and Maya remove her glasses. Later on in the episode, Maya is seen wearing them briefly, likely to prevent Smackle herself from doing so.
- That's So Raven: In "Bend It Like Baxter," Cory wants to impress a girl who likes glasses by grabbing and wearing a pair from the Lost and Found. Reality Ensues when he tries them on and can't see and later gets a headache from doing so.
- Zoey 101: Early in "Trading Places," Lola looks over at the street from the basketball court she and Quinn were playing at and thinks she sees Zoey. Instead of saying something, Lola pulls Quinn's glasses off her face and puts them on. When Quinn starts to ask Lola why she took her glasses, the latter merely says "Look over there!" while still wearing Quinn's glasses. Quinn has to snatch them back.
- In Ignatz and Petra's B support in Fire Emblem: Three Houses, Petra is curious about trying on Ignatz's glasses (as nobody in her homeland of Brigid has bad eyesight, or at least nobody who survives does). Petra proceeds to get nauseous, falls over with Ignatz, and with complete sincerity decides they are like Heroes' Relics that only certain people can use.
- In a panel of Grrl Power, Dabbler keeps Sydney at bay with a hand on the latter's face after stealing her glasses and fooling around with them.
- Questionable Content: While both Faye and Marigold wear glasses, in this strip they choose to try each other's glasses. Faye's prescription is so strong, it shocks Marigold. Faye jokes that Marigold's glasses make everyone look like anime characters...
Marigold: That's not what my prescription is like. [starts to whisper to herself] I wish that was what it was like.
- In an early strip of Scandinavia and the World, Denmark tries out Sweden's glasses after the latter dropped them. Hilarity Ensues, since Sweden is Blind Without Them and Denmark gets nauseous because everything is blurry.
- In a Buzz Feed Violet video titled "Truths Every Girl with Glasses Knows", Sara's friend asks to try on her glasses. Sara obliges, and her friend asks if the glasses make her look like a "hipster librarian" before saying they're blurry. Other videos with titles like "The Stolen Glasses" and "He/She/They Stole Her/His/My Glasses" are similar.
- Abby Hatcher: In "Abby Loses Her Glasses," Princess Flug briefly comes into the possession of Abby's glasses and initially doesn't want to return them due to receiving compliments while wearing them.
- American Dad!: In "Don't Look a Smith Horse in the Mouth," Francine yanks Steve's glasses off his face and asks if she looks smart in them when she and Stan come home drunk one night.
- In "The Big Blow-Up," Francine grabs Arthur's glasses off his face and puts them on during an argument she and Brain are having over a soccer game, claiming Arthur's not trustworthy because of his bad eyesight.
- At the beginning of "D.W. Tale Spins," D.W. puts on Arthur's glasses to imitate him before claiming she can do anything he can.
- As Told by Ginger: In "Wicked Game," Noelle loses her glasses in a bet to Polly Shuster, who later wears them for a little while.
- Dexter's Laboratory: In "Framed," Dee Dee steals Dexter's glasses and mocks him with them while the two kids are on the bus to school. Later on, after he retrieves his broken specs from the floor of the bus, he lets another girl try them on when she compliments him on them.
- Family Guy: In "The Heartbreak Dog," Chris reveals he loves trying on other people's glasses upon seeing a pair stolen from a nursing home by Meg. When he does try them on, he gets a headache and suddenly remembers that particular downside of wearing other people's glasses.
- KaBlam!: In one episode, Betty-Anne Bongo from The Off-Beats loses her horn-rimmed glasses. The Populars find and hide them from her, with Trina wearing them (she claims she's just "keeping them warm" for Betty).
- The Loud House:
- In "Picture Perfect," while trying to make his sisters look presentable for a sibling photo reshoot, Lincoln removes Lisa's glasses and puts them on Leni to make the latter look smarter (than she already is, as he himself says).
- In "The Old and the Restless," Lincoln takes a passerby man's glasses and puts them on when the boy thinks he sees Pop Pop about to skydive.
- Rugrats: "Chuckie Loses His Glasses" revolves around this. When Angelica and later Tommy put on his glasses, they see the same stuff he does without them. Angelica eventually gets so dizzy from wearing them, she gets sick... all over her dad's sweater.
- The Simpsons:
- Other characters sometimes steal and wear Millhouse's glasses, with Bart even using them as goggles in one episode.
- In "$pringfield", Homer finds a pair of glasses in the toilet and decides to keep them (unknowingly swiping the ones Henry Kissinger wears) after he likes how intelligent he looks with them. Even if, from his new perspective, wearing them makes Bart and Lisa look like something from a Salvador Dali painting.
- Steven Universe: In "An Indirect Kiss," Steven asks Connie if he can wear her glasses in exchange for him continuing to tell her the story of why there's a fence around a cliff. She agrees, in exchange for his juice box, and he wears them for much of the remainder of the episode.
Steven: How do I look?
Connie: [squints] I have no idea.
- W.I.T.C.H.: In "K is for Knowledge", Uriah Dunn purposely bumps into Taranee, which causes her to drop both her books and her glasses. He steals the specs and later puts them on to mock her.
- As mentioned up top in the description, this can and does happen quite often to grade school age glass-wearers. Although quite annoying, there are those who sincerely don't mind letting others wear their glasses.
- This also happens among friends who are older teenagers or young adults, often in a self-deprecating kind of way. This is better when done with close friends and isn't a good flirting method like some media would lead you to believe.