What type of frame is most suitable for children?

The most suitable type of frame for children is one with deep lens grooves. This design is particularly beneficial because it helps to hold the lenses more securely within the frame, reducing the risk of them popping out during normal wear and tear—a situation that is common with active kids. Additionally, deep grooves can be advantageous when fitting the lenses properly, ensuring optimal alignment with the child's vision needs.

The other options, while they might have their merits, do not provide the same level of safety or usability for children. Frames that are lightly constructed copies of adult frames may lack the durability needed for the rigorous activity levels of children. Nylon cord frames, although lightweight and flexible, might not offer the stability that frames with deep grooves provide in protecting the lenses. Slightly larger frames that children can grow into may lead to proper alignment issues and can be uncomfortable if the fit is not proper, making them less ideal for consistent daily wear.

Choosing a frame with deep grooves represents a balance of practicality, safety, and function, making it the best choice for younger wearers.