Hello Jasraj, thank you for your comment. We always process the right "index" lenses you choose for eyeglasses. The reason that there seems to be a lot of difference simply because of the frame size. There are many factors that affect lens thickness. One of which is, the higher the prescription, the thicker the lens. Another thing is the lens height. The bigger the lens, the thicker it tends to be, and the lens width and height are predetermined based on the frame you choose. Moreover, if the PD is smaller to the frame and the special lenses are needed, this can cause for the temporal side of the lenses to be thicker than the nasal side of the lenses. Also, it is recommended to get a full rim acetate frame if you have a high prescription as they can help hide the thickness on the edge. Our 30-Day Exchange & Return for unsatisfactory glasses in which you can get an exchanged or refunded within 30 days of receipt is only is eligible for each order. Though as checked that this is already a compensation order, please still allow us to help you. Our CSR will reach out to you via email within 24 to 48 hours. Please check your inbox or spam mail. Thank you and stay safe!