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

TheraSpecs Z-Blue™ come in three different tint strengths: "standard" - which filters 35% of light, "extra" - which filters 50% of light, and "max" which filters 84% of light.

Z-Blue is designed for wearing around flashing or strobing lights, as well as repeating patterns. As part of a light management toolkit, we recommend Z-Blue (in Extra or Max strength) for people with photosensitive epilepsy and seizure disorders; we recommend Z-Blue (in Standard or Extra strength) for brain injury survivors who are looking for protection in a variety of bright environments.