I'm doing a science project and need to use a laser pointer. The project is about making a toy for children aged 9 to 12. Since light from a laser pointer is harmful to the eyes, I want to put maybe a material to filter some harmful stuff or something from the laser light. If possible, please tell me where I can purchase it. Other ways to make laser light less harmful are welcome.
I don't think the light from a cheap low power laser pointer can harm eyes. Check that the power level is less than 1 mW.
The US limit is 5 mW, but the UK limit is 1 mW, so I'd stick with less than 1 mW