A group of ophthalmic researchers investigated the pupillary light reflex in humans. They measured how pupil diameter changes as the light intensity directed at the eye increases.
Table 1 shows their measurements for three healthy adult participants across four different light intensities, along with the calculated mean.
| Light intensity (lux) | Participant 1 pupil diameter (mm) | Participant 2 pupil diameter (mm) | Participant 3 pupil diameter (mm) | Mean pupil diameter (mm) |
|---|---|---|---|---|
| 5 | 7.8 | 8.2 | 8.0 | 8.0 |
| 50 | 5.4 | 5.6 | 5.2 | 5.4 |
| 500 | 3.3 | 3.1 | 3.2 | 3.2 |
| 5000 | 2.1 | 1.9 | 2.0 | 2.0 |
Give one conclusion that can be made from the data in Table 1.
