Dear Customer, thank you for contacting Firmoo. We offer a 1.56 index lens for sunglasses by default. If you want to upgrade the lens, please contact firstname.lastname@example.org. Notice: The lens may not be as thin as you expect if you decide to upgrade them because the frame of sunglasses is generally large. So, if your prescription is strong, you are suggested to choose a small regular eyeglasses frame and select a colored lens or polarized lens from the option. Here are the detailed instructions:https://www.firmoo.com/help-p-107.shtml
. For any further questions or immediate assistance, you may also call our call center thru toll-free hotline at 1-855-487-6006 opens every day from 7 a.m.- 4 p.m. PDT. You can also contact us through our Live Chat Support Team: Start a live chat (Everyday, 4 a.m.-10 p.m. PDT.) or email us at email@example.com. Please stay safe and healthy! Thanks!