$25.9 is a pair of complete prescription sunglasses,we provide free assembling service.
The difference between 1.56 index lens and 1.61 index lens:1.61 index lens relatively thinner,relatively harder.
Special diopter please contact our customer service.
PLS tell us：
1.the color of frame(Black/White/Red)
2.the color of lens
3.your specific prescription