What causes presbyopia?
In younger eyes with no vision problems, the lens is usually softer and therefore easier to curve and flex but, as we grow older, the lens can harden. Presbyopia is caused by this hardening of the lens of your eye, which is a natural part of the ageing process.
As your lens becomes less flexible, it becomes more difficult to change shape in order to focus on close-up objects, which in turn affects your vision. Even if you have never needed glasses, you might find that you need to begin wearing glasses later in life for close-up tasks such as reading, looking at your phone, or even driving.