What is the name of the triangular corners where the upper and lower lids meet?

The triangular corners where the upper and lower eyelids meet are referred to as the canthi. The term "canthus" is derived from the Greek word for angle, and these structures are important anatomical landmarks for the eye. Each eye has two canthi: the medial canthus, located towards the nose, and the lateral canthus, located towards the side of the head. Understanding the anatomy of the canthi is essential for various ophthalmic procedures and assessments.

In terms of context for the other terms: pupils refer to the openings in the center of the iris that allow light to enter the eye, the limbus is the border area between the cornea and the sclera, and fornices are the areas at the junction between the eyelids and the eyeball that accommodate the movement of the eyelids. These terms, while also related to the anatomy of the eye, describe different structures and do not pertain specifically to the corners where the eyelids meet.