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Accomodating
Reading addition
Lens distance compensation

Reading addition

A problem with aging is the declining abbility of the eye to accomodate (especially to focus nearby).  Reading glasses help our eyes in that respect. Under water our eyes have to accomodate even more because of the refractive differences so 'reading' is an even bigger problem. The 'underwater' reading lens will have to be adjusted (higher refractive power) compared to your regular reading prescription. Howmuch more depends on the distance you want to read underwater. Usually a little closer then the 'normal' reading distance since your instruments on your wrist are closer then a book you would read (above water that is).  Since this is a challaging subject for most we recommend to contact your opticien for advise.