can I mount my bifocal prescription lenses in either the CRessi-sub (sku csbmb) or the Aqualung Look two window mask? If I do, is this a life-time dedication of these lenses or can they be returned to regular frames?
You can use dive optix
and it will be as long as you want and can switch back any time. http://www.leisurepro.com/Prod/AQUDO.html