The conversation between human and AI assistant.
What is the difference between a 6/6, 6/9, etc., eye vision?
So, what does each number represent in the fraction?
The first number represents the distance from which a person is viewing the chart, usually 6 meters. The second number indicates the size of the smallest letters that the person can read from that distance. For instance, 6/6 means that a person can see the smallest letters at 6 meters that a normal person should be able to see at 6 meters, while 6/9 means that a person can only see the letters at 6 meters that a normal person should be able to see at 9 meters.