Parinaud's syndrome is when a person has trouble moving their eyes and looking upwards. It's like when you try to look up at the sky but your eyes won't go all the way up. This can happen when there is something wrong with the brain, usually in the area called the midbrain.
People with Parinaud's syndrome can also have other problems, like trouble controlling their eyelids, making facial expressions, or moving their neck. They might also have trouble seeing things close up, like when they try to read a book.
This condition is named after a doctor named Henri Parinaud, who first described it in the late 1800s. It's not very common, but it's important to get it checked out by a doctor because it can be a sign of a more serious problem.