A contact lens worn each night could remove the need for reading glasses in middle age.

http://www.dailymail.co.uk/health/article-2303827/The-contact-lenses-worn-night-mean-youll-longer-need-reading-glasses.html

A contact lens worn each night could remove the need for reading glasses in middle age.
The technique - which experts liken to braces for the teeth - alters the shape of the eye to correct vision, without needing glasses or surgery.
The lenses work by gently pressing on the eye to restore it to the shape of someone with normal vision.

Because they are worn while asleep, the wearer no longer needs their vision corrected during the day with reading glasses.
And because the lenses aren't worn in the day, the eyes still get sufficient oxygen.
Most middle-aged people experience some age related decline in near vision, known as presbyopia.