One idea could be that without his glasses, Harry has a hard time recognizing his friends at first. This leads to some comical misunderstandings. For example, he mistakes Ron for a first - year student and tries to give him advice. Another plot could be that his lack of glasses makes him more vulnerable in a duel because he can't see the spells coming clearly. It could add an extra layer of danger and suspense to the story.
Well, perhaps in this fanfiction, without his glasses, Harry discovers a new magical ability that compensates for his poor vision. Maybe he can sense magic in a different way, like feeling the vibrations of spells in the air. This could lead to him being able to detect dark magic more easily. Also, it could be interesting if he had to rely on Hermione's descriptions more often, which would strengthen their friendship in a different way.
Another plot could be that without his glasses, Harry is mistaken for someone else in the wizarding world. This leads to all sorts of comical and at the same time dangerous situations as he tries to figure out who this other person is and why they are important. He might get involved in a mystery that has to do with his doppelganger.
A possible plot could involve Harry being forced to go without his glasses during a crucial part of a battle or a mission. Since he can't see clearly in the traditional sense, he taps into a latent magical ability that he didn't know he had. This new ability not only helps him in that situation but also changes the way he approaches magic in general. Also, perhaps a potion is spilled on his glasses and he has to go without them for a while, and during this time he meets a mysterious character who has a special connection to his lack of clear vision.
One idea could be that in a magical accident, Harry's glasses are broken and he has to rely on his other senses and the help of his friends more than ever. For example, Hermione could use a spell to temporarily enhance his other senses. Another plot could involve a villain who targets Harry's glasses to disable him, leading to a race against time to get new ones or find a magical cure for his bad eyesight.
One plot idea could be that Harry is blindfolded and without his glasses during a dangerous game at Hogwarts. His friends have to guide him through a series of magical obstacles using only non - visual cues. Another could be that a spell has made him blindfolded and lost his glasses, and he discovers a new magical sense within himself to navigate the wizarding world. Maybe in a situation where he's kidnapped by dark wizards, they take his glasses and blindfold him, but he manages to escape using his other skills and the help of some unexpected magical creatures.
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.
One interesting fanfiction could be where Harry discovers a spell that temporarily changes his eyesight so he doesn't need glasses. This could lead to all sorts of new adventures as he no longer has to worry about his glasses getting broken during Quidditch or in a fight. He might even be able to use this new ability to his advantage in his battles against Voldemort.
Well, perhaps without his glasses, Harry stumbles right into a hidden passageway he didn't know about before. Inside, he discovers a long - lost spell or a mysterious artifact that plays a crucial role in the fight against Voldemort later on. Since he couldn't see clearly, he was just wandering around blindly and happened upon this amazing discovery.
One possible plot could be that without his glasses, Harry discovers he has a new magical ability related to his vision. Maybe he can see magical auras more clearly and it helps him in his fight against the dark forces. For example, he can easily detect hidden Death Eaters by the color of their auras.
One possible plot twist could be that without his glasses, Harry has a hard time recognizing his captors. It might turn out that they are people he thought he could trust, like some seemingly friendly Hufflepuffs who are actually under the Imperius Curse. This would add an element of betrayal and confusion to the story.
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.