The Plastic Plus UV 420 lens blocks 400-420nm of High Energy Visible (HEV) light in addition to UV-A and UV-B.
In UV 420 lenses, the photochromic dye is dispersed in the lens material blocking light by absorbing it. These lenses have excellent UV-blocking performance and last longer (because scratches to the surface do not degrade their function).
UV420 offers minimal residual colour.
Blue Light Radiation Sources
Exposure and brightness outdoors
Use, habits, proximity
Smartphones, tablets, computer screens
LED & CFLs
Who Can Benefit
The shorter wavelength light of 400-420 nm, is more harmful for younger individuals under 20 years old, who spend a lot of time outside in sunlight, because their eye lenses are very transparent.
Individuals who spend a lot of time in front of digital devices can also benefit fit UV & HEV Light protection. Blocking UV and High Energy Visible (HEV) light is critical for protecting eyes against cataracts and age-related macular degeneration (AMD), a medical condition where the macula in the retina degenerates due to aging.
Standardized laboratory experiments show that neuronal retinal cells after exposure to short wavelength light of 411 nm begins to die from higher stress than after exposure to 470 nm light.
Clear Light Benefits
We are still exposed to 40-75% of Ultraviolet rays on cloudy days and 20-30% on rainy days. Clear lenses can be worn under all weather. You can wear clear lenses under all weather and always protect yourself from harmful light. The lenses do not affect the way we see natural colours thus the eyewear with UV420 is suitable of all occasions. Unlike other lenses that are significantly yellow, these are are slightly blue/grey.
– UV 420 is available in Poly 1.60, 1.67 & 1.74 lens materials
– Available in clear single vision and all free form progressives (No Transitions or Polarized)