These lenses correct myopia. They do not correct astigmatism. They are available in the prescriptions: 0, -2, -3, -4, -5 and -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.
The OPTIQUE corrective goggles are medical devices subject to health regulations, as per the EC marking. Carefully read the instructions of the OPTIQUE corrective goggles and ask your healthcare professional for advice.