I have been ordering glasses with almost exactly the same prescription for 20 years.( I am strongly nearsighted.) I have three pairs of glasses of almost the same exact shape with the same prescription. In comparing the thickness of the edges of the glasses made by Glasses2you it is clear to me that they are approximately 1/3 thicker than other glasses of very similar shape with supposedly the same refractive index of 1.74. Thus I am positive that I was cheated by paying for the 1.74 index lenses and receiving instead lenses with refractive index of either 1.5 or 1.56. First they claimed that was because the frames they glazed were rimless as opposed to semi-rimless or rimmed. Then they sent some formula as an excuse for the lack of logic in their reasoning for why their glasses were one third thicker at the edges. In my photos the glasses with the green twist are the ones made by Glasses2you. Buyer beware!