Detailed question:
The film in my AstroSolar® Solar Viewers has a slight bend on one eye. Can I still use the Solar Viewers appropriately ?
Answer: It might be a mark created from the handles. If you look through the Solar Viewers and do not see any white spots, then using them to observe is clompletely safe.
Even a scratch or a damaged spot (less than 0.5 mm), still does not represent a real threat. It is for this reason the film is coated on both sides – to offer the maximum protecion even if one side is damadged.