My best guess is that anyone being born now (and perhaps many of the rest of us) will live to see cures for macular degeneration and glaucoma and most causes of blindness. But at the very least, we will develop workarounds so that the blind can regain a reasonable measure of sight. From Kyle Vanhemert at Fast Company:

“Advanced age-related macular degeneration is the leading cause of blindness in the U.S. in adults over the age of 60. It affects nearly 2 million people in the U.S., with half a million new cases diagnosed every year. It’s a big problem. And until recently, we didn’t have a very good way of treating it. Patients with end-stage degeneration typically had to rely on cumbersome, low-tech solutions to help them see–relics like handheld magnifying glasses and closed-circuit televisions. But earlier this month, a team of surgeons at the UC Davis Eye Center introduced a promising new solution: a tiny, implantable telescope.”