Created for near-sighted swimmers, the TYR Corrective Optical Goggles reveal a whole new underwater world.
Your New Training Partner
This optical goggle's durable polycarbonate lenses stand up to daily use, even if that means ocean-swimming. The silicone gaskets seal comfortably without applying too much pressure, and the incrementally adjustable nose bridge makes finding the ideal fit easy. The TYR Corrective Goggle also features 100% UV protection and pre-applied anti-fog coating. Latex-free.
Finding Your Diopter Strength
As with any prescription lens goggle, you'll need do a quick calculation with your prescription in hand. Find the sphere and cylinder numbers on the prescription (the first should be the sphere; the second should be the cylinder). Plug these numbers into the following formula for your diopter strength:
(1/2)(Cylinder) + Sphere = Diopter
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.