Didymium glasses, also known as glassblowing or lampworking glasses, are specifically designed for individuals working with hot glass or flames, such as glassblowers and lampworkers. They protect against sodium flare, the intense yellow-orange light emitted by hot glass. Didymium lenses filter out this light, improving color perception and reducing eye strain. They are not designed for protection against intense UV or infrared radiation typically associated with welding.