The 2 lenses lock together with a "click" then create a suction onto the glass.
Corrective lens for short-sightedness.
Each lens is independent in order to correct each eye separately.
These lenses correct myopia. They do not correct astigmatism. They are available in the prescriptions: 0, -2, -3, -4, -5 et -6. Each lens is independent in order to adapt to each eye. The optical correction may not be perfectly adapted to your sight. This is not a problem and is not dangerous when exercising for 2 hours, provided that it is as close to your correction as possible. In case of doubt, seek your optician's advice.
I purchased right and left lenses to use in my Easybreath. Closest match to my prescription was -5.
The right and left lens click together and are secured in the mask with a suction cup. The ‘glasses’ are easy to fit and adjust to the right position.
The result was fantastic. I could see!
What a brilliant idea - much safer than snorkelling whilst wearing contact lenses (which is not recommended).