It's called the Snellen chart - and it's the way your eyes have been tested since childhood. The Snellen chart was developed more than 100 years ago to test distance vision. Many of us fail this test.
Modern life demands different skills.
For such near vision, you need the eye coordination of binocular vision. Your eyes must work as a team. Intensive near vision tasks can stress the vision system and produce many symptoms and problems. Many have childhood learning problems . People who work in offices may spend the whole day in front of computers and suffer adult eyestrain .