Near distance eye test

Sit or stand around 30 to 40cm from your screen.
Cover one eye with your hand and try to read the text to the last line. Repeat the test covering the opposite eye.
If you cannot read all of the lines, you likely have a visual impairment.

Presbyopia: Is a condition where, with age, the eye exhibits a progressively diminished ability to focus on near objects. Presbyopia's exact mechanisms are not known with certainty; the research evidence most strongly supports a loss of elasticity of the crystalline lens, although changes in the lens's curvature from continual growth and loss of power of the ciliary muscles (the muscles that bend and straighten the lens) have also been postulated as its cause.