look at, see
睹 centers on the act of looking at something with one's own eyes: seeing or observing directly.
睹 combines 目 (eye) with 者, which likely contributes the sound and the idea of a person or thing being looked at. The exact historical development of the right side is uncertain.
The eye 目 on the left and 者 (person) on the right suggest an eye looking at a person: 睹 means to look at or see.
For ト, imagine looking at a toe: toe -> ト, and your eye 目 sees the toe.