88-90% density (10-12% VLT) Relief from glare is this filter’s strong suit. This lens features a polarized gray-green base with the additional density of a silver mirror complimented by an anti-reflection back coat. Excellent for deep sea fishing, clear bright driving and extreme desert exposure extreme photophobia (light sensitivity) during more mundane applications. Polarizing is NOT recommended where accurate judgement of surfaces and terrain is critical. Polarizing can cause some LCD displays to black out. Available in plastic and NXT, single vision and progressive. Some prescription limitations may apply on NXT availability.