Professional blue light test cards for testing polarized glasses, anti-blue light glasses, sunglasses, etc. Well selected premium material for long-lasting use and durable use. Small and exquisite, used in glasses shop, hospital and various optometry shops.Features-Color:Dark Blue-Material: PVC-Size: About10.00X5.00X0.50cm/3.93X1.97X0.20inch-Manufactured with premium material, durable and serviceable for a long term to use.-The product can test whether your glasses have anti-blue light function and help you choose the right glasses.-Small and exquisite, used in glasses shop, hospital and various optometry shops.-Professional blue light test cards for testing polarized glasses, anti-blue light glasses, sunglasses, etc.-This product is professionally manufactured with stable characteristics and high reliability.