What are Z-Blue TheraSpecs' visible light transmission (VLT)?

Z-Blue™ TheraSpecs come in three different tint strengths: "standard" - which filters 35% of light, "extra" - which filters 50% of light, and "max" which filters 80% of light.

The "max" strength Z-Blue lenses minimize flashing lights that have been shown to trigger seizures, and the "standard" and "extra" strengths are soothing for many brain injury survivors.