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

TheraSpecs Z-Blue® come in three different tint strengths:

• Standard strength blocks 35% of light
• Extra strength blocks 50% of light
• Max strength blocks 84% of light

Z-Blue is designed for wearing around flashing or strobing lights, as well as repeating patterns or for general light sensitivity. We recommend Z-Blue (in Extra or Max strength) for people looking for protection for severe photosensitivity; we recommend Z-Blue (in Standard or Extra strength) for general visual hypersensitivity to the environment.