The Cure of Imperfect Sight by Treatment
Without Glasses - online book

The Original Bates Method, for correcting vision defects

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212         Presbyopia: Its Cause and Cure
column indicates the age; the second, diopters of accom modative power; the third, the near-point for an em metropic1 eye, in inches.
Age
Diopters
Inches
10
14
2.81
15
12
3.28
20
10
3.94
25
8.5
4.63
30
7
5.63
35
5.5
7.16
40
4.5
8.75
45
3.5
11.25
50
2.5
15.75
55
1.5
26.25
60
.75
52.49
65
.25
157.48
70
0
0
According to these depressing figures, one must expect at thirty to have lost no less than half of one's original accommodative power, while at forty two-thirds of it would be gone, and at sixty it would be practically non existent.
There are many people, however, who do not fit this schedule. Many persons at forty can read fine print at fours inches, although they ought, according to the table, to have lost that power shortly after twenty. Worse still, there are people who refuse to become presbyopic at all. Oliver Wendell Holmes mentions one of these cases in "The Autocrat of the Breakfast Table."
. 1A" eye, which, when it is at rest, focusses parallel rays upon the retina, is said to be emmetropic or normal.