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This predominantly depends on the strength of your prescription. The higher the prescription, the higher index is required for ensuring your lenses are as light and thin as possible.
They currently only provide single vision prism lenses at present.
Adapting to any new lenses requires a short adjustment period.
At first, when you walk or move your head rapidly, objects to the side may appear to move slightly. This sensation will disappear quickly with continued use. Your progressive lenses have your distance, intermediate, and reading prescription all in one.
a.) The UV protection level is the most important factor. The sunglasses at Firmoo provide 100% protection or UV400, which means the lenses can effectively block all harmful UV.
b.) Lens color: With darker lens color, it can block light more effectively. But it does not mean the UV protection level is higher.
Yes, there are two ways to buy prescription sunglasses:
A.) Sunglasses with prescription lenses. They have prescription and non-prescription sunglasses.
B.) Regular frames with lenses color. You can also order photochromic lenses, tint lenses or polarized lens for regular glasses, they will work as sunglasses.