| Criteria |
Test Conducted |
Results |
| High Mass Impact test |
Tested against a drop of a harp-edged object weighing 500g (1.13lbs) onto the lens from a height of 50 inches while the lens is fitted in its frame. |
720 lens is impact-resistant. |
| High Velocity Impact test |
Tested against an impact from a steel ball of 6.35mm (0.25 “) in diameter, traveling at a velocity of 45.7 m/s (150ft/s). |
720 lens is impact-resistant. |
| Penetration test |
Tested against penetration from a weighted projectile weighing 44.2 g (1.56 oz) dropped from a height of 127 cm (50 in). |
720 lens is impact-resistant. |
|
Prismatic Power
Refractive Power
Astigmatism test
|
Examined the lens under the following regulation:
1. Prismatic power shall not exceed 0.50 prism
diopter in any direction.
2. Vertical and horizontal prism imbalance shall
not exceed 1/4 prism diopter
3. Horizontal prism imbalance shall not exceed
0.25 diopter "base in" or 0.50 diopter "base
out".
|
720 eyewear approved with no higher than 0.06 of Prismatic and Refractive Power |
| Resolving Power test |
Tested to see whether blurring occurs when the lens is viewed from a distance. The lenses resolves the NBS pattern (vertical and horizontal thin lines are drawn closely together) from 10.67m, and results crystal clear lines in both orientations. |
720 lenses meets NBS Definition Pattern testing resolution >20 at a distance of 10.67m providing excellent optical resolution. |
| Optical Quality test |
Examined for imperfections of thin lines, bubbles, waves or other visible defects that would impair optical quality. |
720 lens is excellent in optical quality. |
| Transmittance test |
Tested against the transmittance for light filtration, while still providing protection against UV Rays. |
720 lens is proven to transmit light well. |
| Cleanability test |
Tested against using cleaning solutions. |
720 lens is not impaired. |
| Flammability test |
Tested against the exposure of flames, fire, and extreme heat to ensure if the frame will not ignite or combust at a rate faster than 76mm (3 in) / min. |
720 eyewear is flame-resistant. |
