The eye is like a camera. The lens in the camera is your natural lens inside of the eye. When you’re young, your lens is very elastic. It’s fantastic at accommodating and focusing on objects whether it’s near or distance. With time, with age, the lens loses its elasticity. It does accommodate less and moves less, which means when you’re around the age of 40, you will suddenly need glasses to read. That is the first thing that happens. It’s the first sign of what you call, ageing of the lens when the lens is becoming a bit older and less functional. This is called presbyopia. Presbyopia affects everyone. It’s just a matter when it appears. Some patients develop around age 40, some patients a bit younger or a bit older. Now, following that, the lens itself starts to change its colour, and it becomes a little bit like yellow colour, so it loses its clarity. At that stage, we call it lens dysfunction or lens dysfunctional syndrome. That is a lens that is not as healthy as used to be.