Presbyopia
Presbyopia refers to the steady loss of the capacity of the eyes to concentrate on adjacent things. It's a normal, albeit an inconvenient, process of growing older. Presbyopia commonly appears during the early stages to mid-40s and worsens gradually till you reach the age of 65.
You are likely to notice that you have presbyopia when you have to hold a book, newspaper, or phone at arm's length to read them. The ophthalmologist can verify presbyopia with a simple eye examination. He or she can also recommend eyeglasses or contact lenses to correct the problem. You may also want to consider a surgical procedure.