Six layers of superior optical coating on each side reduces glare and reflections by up to 99% Wrap around feature with patented self adjusting foam gasket seals out unwanted dust and light. Ideal for curved monitors. Prescribed by optometrists to help provide long-term eye protection. No velcro or tape required. Tested and accepted by the american optometric association. Available in light or dark tint. Sizes fit up to 21" monitors.