The angle where the upper and lower eyelids meet is called the canthus (plural: canthi). More specifically:

• The medial canthus (or medial angle of the eye) is the inner corner where the upper and lower eyelids meet near the nose. It forms the medial end of the palpebral fissure and includes structures such as the lacrimal lake and lacrimal caruncle. The medial canthal angle is typically located about 2 mm lower than the lateral canthal angle in Caucasians and about 3 mm lower in Asians

• The lateral canthus (or lateral angle of the eye) is the outer corner where the upper and lower eyelids meet on the side away from the nose. It is usually positioned approximately 2 mm superior (higher) than the medial canthus, giving the eyelid a slight upward and lateral tilt

Together, these two canthi define the horizontal ends of the palpebral fissure, which is the fusiform (spindle-shaped) space between the open eyelids

. In summary, the angles where the upper and lower eyelids meet are called the medial canthus (inner corner) and the lateral canthus (outer corner)