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If you don't understand, you can contact us via this Kind reminder: It is recommended to inform customer service of the prescription information in the form of text or pictures after ordering, so as to ensure that the prescription filled in the order is consistent with your prescription!!! Please provide your prescription By the following format, Right(OD) SHP: CYL: AXIS : Left(OS) SHP: CYL: AXIS : ADD: PD: Or Send Your Prescription Photo. The following situations may require additional price differences ① When the absolute value of your prescription CYL is greater than 2, you only need to enter (± 2), then enter your prescription information normally and submit the order for payment. If the absolute value of CYL is greater than 2, you need to pay a price difference of $10. ② When your pupil distance is less than 67mm, you will need to pay an additional $10 ③ Hyperopia (reading glasses):If your prescription contains a "+" number, you will need to pay a difference of $10; 10$ Link: How to purchase prescription glasses? 1.How to choose between single version and progressive version? ① When you need to see far and near for use, and there is ADD data in the prescription, please choose the progressive version. ② If you only need to see far or near for use, please choose a single version. 2. How to choose the refractive index of lenses (1.56/1.61/1.67/1.74) （The higher the refractive index of the lens, the thinner the lens, and the more comfortable it is to wear） ① If the sum of your SPH and CYL numbers is less than 300 degrees, it is generally recommended to choose lenses with a refractive index of 1.56. Of course, lenses with a refractive index of 1.61/1.67 are also suitable, as they will be thinner and more comfortable to wear. ② If the sum of your SPH and CYL numbers is greater than 300 and less than 500 degrees, generally choose 1.61 lenses. Of course, 1.67/1.74 lenses are also suitable as they will be thinner and more comfortable to wear. ③ If the sum of your SPH and CYL numbers is greater than 500 and less than 800 degrees, generally choose 1.67 lenses. Of course, 1.74 lenses are also suitable as they will be thinner and more comfortable to wear. ④ If the sum of your SPH and CYL numbers is greater than 800 degrees, a lens of 1.74 is generally chosen.