Is it safe to look a laser beam through sun glasses?
The only glasses it’s safe to look at a laser beam with are proper laser safety eyeware. Different types of eye ware are available for the different types of lasers available. Make sure the eye protection you use is suitable for the type of laser you are using. If you are regularly working on laser optical systems then it is highly recommended that you use laser safety goggles to protect yourself from accidental beam exposure.