One big challenge would be in his studies. Magic often requires precise wand movements and seeing spells being cast by others clearly. Without his glasses, he could misinterpret what a teacher is demonstrating, and this could affect his learning. Moreover, in Quidditch, he would have a hard time seeing the Snitch or other players clearly, which is crucial for the game.
He might start by retracing his steps. He would think about all the places he had been recently and search those areas thoroughly. For example, if he was in the library before losing his glasses, he would go back to the table he was sitting at and look around on the floor and on the bookshelves.
His friends, Hermione and Ron, would surely help. Hermione with her intelligence and Ron with his loyalty.
He probably had trouble seeing clearly. In the wizarding world, even with magic, not having his glasses would make it hard to recognize people from a distance or read small details. For example, in a Potions class, he might not be able to read the fine print on ingredient labels or see the exact color changes in a potion as it brews.
Well, in some fanfictions, Harry might rely on his other senses more acutely. He could use his sense of hearing to detect movements around him. For example, he might be able to tell if someone is approaching by the sound of their footsteps. His sense of touch could also help him navigate his surroundings, like feeling the walls or furniture to figure out where he is.
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.
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.
In the fanfiction, Shacklebolt could be a key figure in a plot related to Harry losing his glasses. He might be involved in a mystery where the loss of the glasses is more than just a simple accident. He could be investigating whether it was a malicious act by some dark forces, and his role could be to protect Harry and find out the truth behind it. He may also be in a position to teach Harry how to adapt to this new situation without his glasses, using his vast knowledge of magic.
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.
One possibility could be that in this fanfiction, Harry's glasses are some sort of magical anchor. Without them, he might accidentally slip into a different dimension. Maybe he was in the middle of a battle at Hogwarts, his glasses got knocked off, and suddenly he vanished. It could be that the glasses were enchanted by Dumbledore long ago to keep Harry in the 'right' magical space, and without them, he's lost in a sort of limbo.
Harry Potter could survive in the dungeon without his glasses by relying on his instincts. He has been in many dangerous situations before and has developed a good sense of danger. He could listen intently for any sounds that might indicate danger or a way out. Additionally, he could try to communicate with magical creatures in the dungeon. Some might be friendly and help him. And if there are any magical objects in the dungeon, he could potentially use them to his advantage. For instance, if there is a magical stone that enhances perception, he could use it to'see' better without his glasses.