Pennsylvania Code
Title 34 - LABOR AND INDUSTRY
Part I - Department of Labor and Industry
Chapter 39 - SAFETY STANDARDS-GENERAL
Subchapter C - HEAD AND EYE PROTECTION
MANUFACTURE OF PROTECTORS
Section 39.572 - Lenses and windows

(a) Design. Protectors shall be so designed as to permit replacing the lenses or windows when necessary without the use of tools of special make or design.

(b) Glass lenses and windows. All lenses and windows of protectors shall be of a quality practically free from air bubbles, opalescence, waves, or other injurious defects or flaws. The front and rear surfaces shall be smooth and substantially parallel unless the lens is ground to provide proper optical correction for defective vision. All lenses shall bear some permanent distinctive marking by which the manufacturer, dealer or distributor may be readily identified.

(c) Dimensions of clear glass lenses. Lenses for goggles of types 1 and 2, if round, shall have a diameter of not less than 1 1/2 inches, and if oval, shall not be less than 1 1/2 inches by 1 15/16 inches. For goggles of type 3, round lenses shall have a diamter of not less than 1 1/2 inches and oval lenses shall have a vertical diameter of not less than 1 1/2 inches and a horizontal diameter of not less than 1 3/4 inches. For goggles of type 4, lenses shall not be less than 1 3/4 inches in diameter. Lenses shall transmit at least 80% of the light.