Eyeglasses

Eyeglasses or spectacles are a pair of lenses worn in front of the face that are normally used for vision correction or eye protection. In mainstream Smurfs media, four Smurf characters wear eyeglasses: Brainy, Narrator, Grandpa Smurf, and Nanny. In the Smurfs cartoon show, Brainy's glasses are made from special sleeping sand that comes from the Sandman, who lives in the Land Of Nod.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, the Smurf character Orbit wears a special pair of wrap-around sunglasses due to his eyes being light-sensitive. In the novel, Papa Smurf is also seen wearing reading glasses.

Brainy and Narrator's respective counterparts on Smurfette Island, Librarian and Storyteller, also wear glasses, while Orbit's counterpart Comet wears wrap-around sunglasses.

Brainy's daughter Sophia constantly wears glasses, which Clumsy's son Goofy finds attractive on her.

RDK Stories
In The Reluctant Dark Knight series, there are only a handful of characters who wear glasses, and most wear them on a need-to-wear basis. Brainy Smurf is the most commonly seen character whose vision is tremendously hindered without his eyeglasses. Without them, he is practically blind and relies on his fellow Smurfs (Clumsy being most willing) to guide him around the Village until he gets them back.

Smurfette, however, does not have prescription glasses; she primarily will wear sunglasses (AKA "shades" or "sun smurfers") when going to the beach on a sunny day with her fellow Smurfs.

Sir Josten has an single optical lens for when he is studying his music notes or writing by candlelight so his vision will not worsen sooner than it needs to, and Moxette has a spare pair of Brainy's glasses that she wears whenever she is mocking him, which actually are not based on his prescription. They have clear lenses so she doesn't risk ruining her own eyesight over time.

Glovey Story
In the Glovey Stories, Glovey and Smurfette wear Sunglasses while they travel in Scotland as they share the Honeymoon they should've had a long time ago. Handy and Vanity develop mirror glasses for Glovey to wear when he performs as well. Other than Brainy, Glovey wears similar glasses when reading or writing letters.

Hero: The Guardian Smurf stories
In the HERO: The Guardian Smurf story series, Brainy's female counterpart Athena also wears glasses, as does their son Smarty and Greedy's female counterpart Baker Smurfette.