To be effective, eye or face protection must: Question To be effective, eye or face protection must: Answers Fit loosely. Be made of material that will shatter. Be free of scratches. Be so tight that eyeglasses will not fit underneath. Explanation Eye or face protection should fasten securely, be free of scratches, be made of material that does not shatter, allow clear views to both sides, allow air to pass through, and allow enough room for eyeglasses or sunglasses to be worn underneath.