As people age, the ability of their eyes to focus on objects near to them weakens. The condition, known as presbyopia, affects more than 1.8 billion people worldwide. Though reading glasses provide a solution to the problem, Orasis Pharmaceuticals is developing a corrective eyedrop it says will provide an alternative. We spoke to Elad Kedar, CEO of Orasis, about aging eyes, its experimental eye drop intended to allow people to free themselves from a dependency on reading glasses, and how it works.