Well, without his glasses, Harry might rely more on his other senses. His magical instincts could be heightened. When dealing with the Snatchers, this could mean he'd be able to sense their dark magic more acutely. He could use this to his advantage, perhaps by using magic to disrupt their search for him. And the Snatchers might underestimate him because they think he's at a disadvantage without his glasses.
A fanfiction like this could explore Harry's character in a new light. Usually, his glasses are a part of his iconic look. Without them, he's not only physically different but also psychologically. He might feel more exposed and less confident. This could change how he approaches situations with the Snatchers. For instance, he might be more hesitant in making decisions or using magic, which could have a big impact on the outcome of any encounters.
He could misidentify people. Maybe he mistakes a Slytherin for a Gryffindor and gets into an awkward situation. It would be a humorous scenario where he has to quickly correct himself.
Well, if the Snatchers made Harry lose his glasses, it could change the whole dynamic of his character. Harry is known for his glasses as part of his identity. Without them, he'd be in a rather difficult position. He might be more likely to be caught by the Snatchers as he wouldn't be able to see clearly to escape. It could also lead to some character development where he has to overcome this new obstacle, perhaps learning to trust his instincts more than his sight.
Well, he might be stumbling around a lot. Without his glasses, Harry's vision is really poor. He could easily bump into things in the tunnel, like hidden magical creatures or even some sort of magical traps. Maybe he'd be using his other senses more, like his sense of hearing to detect any approaching danger.
He might end up in a place where he can't see clearly without his glasses and struggles to find his way. For example, he could be in a dark forest where he stumbles around, trying to figure out where he is and how to get back. Without his glasses, his magical abilities might also be affected in some way, like his spell - casting accuracy.
Well, it might also lead to a change in the dynamic among the characters. For example, Hermione or Ron might have to take on a more protective role towards Harry. They would need to be his eyes in a sense, guiding him and making sure he doesn't get into more trouble. Plus, it could be a plot device for the author to introduce some sort of magical solution to the problem, like a spell that temporarily restores Harry's vision without his glasses.
He could try to trick the Snatchers into giving them back. Maybe he pretends to be more injured or incapacitated than he really is, and when they come close to check on him, he quickly grabs his glasses back.
There are fanfictions where the Snatchers don't even notice Harry's glasses at first. But then, when they do, they might mistake them for something valuable or magical. However, Harry could use this misunderstanding to his advantage. For example, he could pretend that the glasses are a powerful magical relic that would cause great harm if they were damaged, which might make the Snatchers hesitant to touch them.
It could be really interesting. Maybe without his glasses, Harry would seem more vulnerable, and Malfoy might take advantage of that in a different way than in the original story. They could have more intense eye - to - eye confrontations that are different from the ones where Harry is hidden behind his glasses.
Perhaps in this fanfiction, Harry is in a cage as part of a magical experiment. Some rogue wizards are trying to study how a wizard's magic is affected without their usual aids, like Harry's glasses. In the cage, Harry discovers new aspects of his magic that he didn't know before. He could start to manipulate the magical energy around him in different ways, even without clear vision, and eventually break free from the cage and confront those who put him there.