These glycerin "smart glasses" may be the only specs you'll need – although they do need a design intervention at some point.
Sometimes, wearing eyeglasses can be a pain. You need to change them with every new prescription and in addition they don't always serve you well enough. Reading glasses, for example, help you focus up close but become useless if you need to go back to doing other activities. According to the American Academy of Ophthalmology more than 150 million Americans use some type of corrective eyewear, spending $15 billion each year. We may all need glasses at some point, because as a natural side-effect of aging, the lens inside our eyes that adjusts the focal depth depending on what we look at, loses its ability to change focus.