ABO NOCE Practice Test

The correct choice for the type of ball used to test impact resistance for safety lenses is the steel ball. This is because safety lens standards, such as those set by the American National Standards Institute (ANSI), specifically require the use of a steel ball in impact tests. The steel ball's density and weight make it a significant challenge for lenses, allowing for a rigorous assessment of how much impact a lens can withstand without breaking.

Using a steel ball in these tests simulates real-world scenarios where safety eyewear may be exposed to sharp or heavy objects, ensuring that the lenses provide adequate protection to the wearer. The test typically involves dropping the steel ball from a specified height onto the lens to evaluate its resistance to impact.

In contrast, other materials such as rubber, glass, or plastic do not meet the same criteria for testing impact resistance in safety lenses, as they could either provide less pressure or not accurately imitate the potential hazards faced in hazardous environments. Therefore, the steel ball is the standardized choice to effectively measure the lenses' durability and safety compliance.