Presbyopia (old age loss of accomidation or loss of near vision with age due to increasing lens stiffness and weaker muscles) is what you are referring to. It come to practically everyone as they age and affects different people at different ages. Nearsighten individuals are usually the first to have the issue. I am 56 and have had this issue for the last 5 years. I use the little stick on diopters (Diveoptiks?) that you place in the bottom half of your mask to be able to read my gauges. No contacts or other lenses as I am 20/20 otherwise. They are available at your local dive shop, Leisurepro, Amazon, etc.
They don't appear work with prescriptions (contact or lens). I also have two different prescriptions, one for each eye. This looks like a great solution for people who need readers.