As people age, their pupils become smaller, and open less wide in dim light.
|
Age (years) |
Diameter of pupil in millimeters | ||
|---|---|---|---|
| daylight | night | difference | |
| 20 | 4.7 | 8.0 | 3.3 |
| 30 | 4.3 | 7.0 | 2.7 |
| 40 | 3.9 | 6.0 | 2.1 |
| 50 | 3.5 | 5.0 | 1.5 |
| 60 | 3.1 | 4.1 | 1.0 |
| 70 | 2.7 | 3.2 | 0.5 |
| 80 | 2.3 | 2.5 | 0.2 |
| home | | | people index | | | search | | | your comments  | | | about | | | help | | |
Copyright © 2000 Sizes, Inc. All rights reserved.
Last revised: 20 August 2004.