Structure / Circular opening
Oculus
/ˈɒk.jʊ.ləs/noun
Latin oculus, “eye.”
Definition
A circular opening at the crown of a dome or set into a wall, admitting light and air. The Pantheon in Rome has the best-known example.
Fig. 62 — Oculus: schematic studyNOT TO SCALE
Illustrative study — Oculus · AI-generatedSAMPLE IMAGE
Photo study — Oculus · AI-generated00:06
Structural & construction notes
At a dome crown, a compression ring around the oculus resists the inward thrust of the shell. Open oculi need drainage in the floor below; glazed ones need weathering and condensation control at the frame.
An educational reference. Project-specific design requires professional guidance.