Harry could initially be in a state of panic. He's used to having his glasses as an essential part of him. Being tied up and without them makes him feel extremely vulnerable. However, he quickly tries to calm himself down and focus on his magic. He might start to recall some of the more instinctive magic he's used in the past, like the time he made the glass in the snake enclosure disappear. He hopes to use this kind of magic to free himself or at least get his glasses back.
He might be very frustrated. Without his glasses, he can't see well, which is a big handicap for him. He could be trying to use his other senses more acutely, like listening for any approaching footsteps or voices. He might also be thinking of ways to break free from the bindings using some basic spells he can do without clear vision, like a simple levitation charm to try and reach for his glasses if they're nearby.
Well, Harry is a brave character. So even though he's tied up without his glasses, he doesn't lose his composure completely. He first tries to assess the situation as best he can. Since he can't see clearly, he starts to communicate with his captors (if there are any). He tries to reason with them or stall for time while he figures out a plan. He may also try to call for help magically, using a Patronus charm if he can muster enough concentration without his glasses, hoping that it will reach someone who can come to his rescue.
Harry might initially be in a state of shock. He has always been able to rely on his glasses to see, and without them, the world is a blur while he's being tortured. This could make him angry too. He might lash out blindly, trying to cast spells in the direction he thinks his enemies are, even if he's not sure. And as the torture continues, he could become more determined to resist, using his strong willpower to endure the pain and fight back in whatever way he can.
He might be initially panicked. Since his glasses are essential for him to see clearly, not having them would make him feel very vulnerable and exposed in a dangerous wizarding world.
Well, Harry could also be more level - headed. He might try to figure out Draco's motive first. Since he's used to Draco's antics, he could choose to outwit Draco instead of getting into a physical or shouting match. He could use magic in a clever way to get his glasses back without causing too much of a scene.
One possible plotline could be that Harry is captured by some dark wizards who want to interrogate him about the Order of the Phoenix. Without his glasses, he's at a disadvantage, trying to sense his surroundings magically while tied up. They might be trying to find out the location of the Order's secret hideout.
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.
Harry could be really angry. He might immediately try to get his glasses back, using some basic spells or just by physically trying to grab them from Draco. He'd be frustrated that Draco is always causing trouble for him.
Some characters would react with shock. For example, Ginny would be outraged that someone would do such a thing to Harry. She would be ready to fight whoever was responsible. Luna, in her unique way, might see it as an interesting new state for Harry. She could offer some of her strange but useful magical items to help him. And a Hogwarts teacher like McGonagall would be strict about finding out who was behind it. She would also make sure Harry was taken care of, ensuring he had proper assistance in getting around until the situation was resolved.
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.
His relationships might change. Some of his friends might not recognize him at first without his glasses. This could lead to some initial awkwardness but also force him to re - establish his connections in a new way. He might also attract new attention from characters who were not interested in him before, either romantically or as potential allies or enemies. This new social dynamic could cause him to grow as a character and develop different aspects of his personality.
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.