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Many people around the world use conventional masks simultaneously with eye glasses. These masks, due to the gap between the face and the lenses, cause the lenses to steam up.
Siliard is a piece of silicon behind which an empty space is provided causing Differential Pressure between the outside and inside air.
The incision below this piece prevents the expired air from passing upward; the lenses would not therefore steam up.
These masks are suitable for dentists and surgeons and could as well be widely used in laboratories.
Islamic Azad university Center Bran
Art and Architecture Islamic Azad university of Tehran