Does reading in dim light cause myopia? My daughter is nearsighted and needs glasses. I’m wondering whether her myopia was caused by reading in low light and watching too much tv. Is this possible?

Reading . Reading in dim light or watching too much tv will not affect her eye sight. As long as she is comfortable, i would not worry about it.
Myopia. Prolonged near work can increase myopic progression in children. If a significant progression is occuring, you can consider dilute atoprine, glasses correction with progressive bifocals, specially designed contact lenses to eliminate peripheral blur, or other treatments.