Protective filters.
Bell
G R
GR
D005135:Eye Protective Devices; D005139:Eyeglasses; D005374:Filtration; D006801:Humans; D007259:Infrared Rays / Q000009:adverse effects; D007908:Lens, Crystalline / Q000528:radiation effects*; D011482:Protective Devices; D013472:Sunlight / Q000009:adverse effects; D014466:Ultraviolet Rays / Q000009:adverse effects