Peak Vision SD7 Golf Sunlgasses The Science Behind Dual-Zone Light Management The Bright Sky generates over 80,000 LUX units. Simultaneously, the turf reflects only 4% of the ambient light, solid-tint ( amber or grey) cannot optimize vision across these lighting extremes. Lens Distortion Optional distortion with high-performance golf. PEAKS Dual-Zone/Zero Distortion Lens Technology. No bi-refringent distortion. Reduced Chromatic Aberration (Lens Clarity, high 45 abbe value). Polycarbonate Lenses exhibit significant optical errors. Bi-refringent (Appears as rainbow). Chromatic Aberration (Lens Haziness poor 28 abbe value