Minimum Eye Focus Distances for Four Age Groups
|
Age 15 |
Age 20 |
Age 25 |
Age 30 |
|
4.6
|
4.7
|
5.6
|
6.0
|
|
4.9
|
5.0
|
5.9
|
6.8
|
|
5.0
|
5.1
|
6.6
|
8.1
|
|
5.7
|
5.8
|
6.7
|
8.4
|
|
6.3
|
6.4
|
6.8
|
8.6
|
|
6.8
|
6.6
|
7.4
|
8.9
|
|
7.4
|
7.1
|
8.3
|
9.8
|
|
7.9
|
8.3
|
9.6
|
11.5
|
The values in the table above are the minimum distances that subjects in four different age groups could
clearly see print on a page held in from of them. (Eyes tend to lose their ability to focus on close objects as they age.
The expectation is that the distribution for an older age group is stochastically larger than the distribution for a younger
age group (since younger eyes tend to be more flexible and can focus on near objects better).)