What is the ANSI drop-ball test specification for dress eyewear?

• A. Lenses designed for dress eyewear must withstand the impact of a 5/8-inch steel ball dropped from a height of 50 inches.
• B. Lenses designed for dress eyewear must withstand the impact of a 1-inch steel ball dropped from a height of 50 inches.
• C. Lenses designed for dress eyewear must withstand the impact of a 5/8-inch steel ball dropped from a height of 60 inches.
• D. Lenses designed for dress eyewear must withstand the impact of a 1/2-inch steel ball dropped from 50 inches.

Answer: (A)

ANSI tests set a specific impact energy for dress eyewear by using a steel ball of a defined size dropped from a defined height. For dress eyewear, the standard specifies a 5/8-inch diameter steel ball dropped from 50 inches. This combination is chosen to simulate a common, everyday impact without making the test so severe that it would apply to all safety eyewear. The energy from that ball at that height is enough to check that the lens and its mounting won’t crack or allow penetration, while remaining practical for production testing.

The other options change either the ball size or the drop height, which would deliver different impact energies and do not match the dress eyewear specification. A larger or higher-ball drop would impose a more stringent test than intended for dress eyewear, while a smaller ball or different height alters the energy level away from the standard.