*** This is an AquaGear Close-Out Item - Limited to Quantity in Stock ***
Use the Tusa Liberator Lens lens to replace the standard non-prescription Liberator Lenses. Available in diopter from -2.0 through -7.0 in 0.5 increment. -4.0 through -7.0 call for special order.
Finding Your Diopter Strength
Although similar to your glasses prescription, swim goggle diopter lenses require a quick calculation to ensure that the proper strength is selected and post-swim headaches are avoided. Looking at your prescription, you'll want to locate the sphere and cylinder for each eye. Use the following formula to find the right diopter lens for you:
(1/2)(Cylinder) + Sphere = Diopter
Example: If your left eye (OS) has a sphere of -4.5 and a cylinder of +.25, your diopter strength would be as follows:
(1/2)(.25) + (-4.5) = -4.375
Remember: Water will refract light and correct vision a bit without any prescriptive power applied. With that in mind, if your calculation does not end with a .5, select a diopter strength that is one step lower than the outcome of your calculation. In the example above, with calculation of -4.375 you should order a -4.0, not -4.5 diopter strength. If you need help, please give us a call or open a chat session for guidance.
Simple conversion for V-3A
Super Anti-Fog treatment
Smoke lens only.
Choose your prescriptions from the options. Price per each lens - add two lenses to cart.