Swim goggle information available in whole diopters 1.00 To 8.00 And in half diopters -1.50 To -5.00 And in non-prescription fully assembled . For prescription, order eye cups sold in pairs , strap includes strap and nosebridges and prescription lens powers of choice, one power for each eye. These goggles are returnable in original condition and packaging. For prescriptions with astigmatic power second number or cyclindrical number of over -1.00, You may need to go into a custom made goggle for good vision. To determine what power of lenses you need, read how to read a prescription on our faq page. Or, you can order what you think you need, and you can enter your prescription in the spaces provided. We will verify if you ordered the right lenses or if we think there needs to be an adjustment, we will manually change the order to the best power for your prescription. Modular goggles assembled in just seconds, or pre-assembled non-prescription goggle.You can pick different prescription powers for each eye, and if your prescription changes, you can change one or both lenses without having to purchase another goggle. Lenses offer 100% protection, so they can be used indoors or outdoors. They also have a high performance anti-fog treatment on the lenses to prevent fogging. The light smoke color are light enough to be used indoors, while offering some protection from the sun's glare outdoors. Comes with an adjustable nosebridge made of flexible, soft plastic. The goggle uses a ...