Well, it could start with Harry being lured into a trap by some mysterious enemies. They might be after the secrets of Dumbledore's Army or something. Once trapped, they start torturing him. His glasses could be lost when he's thrown around during the torture. Then, he might use his magical skills, like his ability to communicate with snakes (which he has from being a Parselmouth), to call for help or find a way to escape. He'd be at a disadvantage without his glasses, but his determination would keep him going.
Maybe Harry is on a solo mission to find a hidden magical artifact that could help defeat Voldemort. But an evil wizard who also wants the artifact captures him. This wizard tortures Harry to find out where the artifact is. In the process, Harry's glasses are lost. Harry, though in pain, remembers some of the advanced defensive magic he learned from Professor Snape (before he knew Snape was on his side). He uses this magic to create a diversion and tries to search for his glasses so he can see better to make his escape.
Well, perhaps Harry could be captured by a group of rogue Death Eaters who still believe in Voldemort's ideology. They torture him to find out if there are any remaining secrets of the Order of the Phoenix. In the process, his glasses get broken or lost. Harry then has to rely on his other senses and magic to try and escape. This could lead to a story of his inner strength and how he overcomes the physical handicap of not having his glasses.
In the fanfiction, when Harry Potter loses his glasses, it could lead to some really interesting character development. For example, his friends might have to step up and protect him more. Also, it could be a chance for him to discover new magical ways to improve his vision without the glasses, perhaps a spell or a potion that he has to search for.
I'm not aware of any extremely famous fanfiction with that exact plot. There are thousands of Harry Potter fanfictions out there, but this seems like a rather specific and somewhat dark concept that may not be as widespread in well - known fanfictions. However, it's possible that there are some niche or more adult - themed fanfictions with this idea, but I can't recommend those as they might not be appropriate.
It could be a group of rogue Death Eaters who think that kidnapping Harry would bring them back into Voldemort's good graces. They might take his glasses as a way to humiliate him, seeing Harry as the symbol of their defeat. They underestimate Harry's resourcefulness even without his glasses.
Well, maybe he stumbles around blindly for a while, bumping into things and getting into all sorts of comical situations. He could also rely on his friends more to help him get around until he finds his glasses.
In this fanfiction, it could be that the pressure of being 'The Chosen One' finally gets to Harry. All the battles, the losses he has endured, and the constant threat of Voldemort might push him over the edge. He could start acting erratically, pushing away his friends and allies because he no longer trusts his own judgment.
I'm not entirely sure what specific situation you're referring to. In the Harry Potter series, Harry is the one who wears glasses, and he has his own share of hardships but not in a context of 'tortured and puts glasses on' in the original. In fanfiction, this could be some really out - of - the - box or dark interpretation where perhaps an author has created a scenario where Harry is tortured and then his glasses are put on him in a cruel or strange way. But without more context, it's hard to say exactly.
A plot twist could be that Harry's kidnapping and loss of glasses is the result of a time - travel mishap. A future version of himself (or someone else) accidentally causes the present - day Harry to be kidnapped and lose his glasses. The future version is trying to change the course of events for the better but ends up creating chaos in the present. Harry, without his glasses, has to figure out what's going on and how to fix the time - line while also escaping from his kidnapper. Another twist could be that the kidnapper is actually an undercover Auror gone rogue who is using Harry as a bait to draw out a much larger and more dangerous criminal organization. Harry's glasses are lost in the process, and he has to figure out who to trust among his captors.
In a fanfiction, if Harry Potter loses his glasses, the plot will likely take a different turn. His lack of clear vision could make him seem less confident, which would change how others perceive him. Enemies might underestimate him, giving him an opportunity to surprise them. His search for a replacement or a solution to his vision problem could introduce new characters, like an old wizard who specializes in eye - related magic, and new sub - plots could unfold as a result.
His friends, Hermione and Ron, would surely help. Hermione with her intelligence and Ron with his loyalty.