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The canthus is the corner of the eye where the upper and lower eyelids meet. Each eye has an inner (medial) and outer (lateral) canthus, which help guide eyelid movement and tear flow. The inner canthus connects to the tear ducts, directing tears toward drainage openings. Keeping the canthus area clean helps prevent irritation or infection. Healthy canthi support smooth blinking and protect the eye from dryness and debris.
read more about the canthus ...The canthus is the corner of the eye where the upper and lower eyelids meet. Each eye has a medial (inner) and lateral (outer) canthus. The inner canthus sits near the nose and connects to the tear ducts. The outer one lies near the temple and helps guide eyelid motion. Both work together to close and open smoothly while keeping the surface moist.
The medial canthus includes the lacrimal caruncle and plica semilunaris within its soft tissue fold. The lateral canthus is defined by the lateral palpebral raphe anchored to the orbital rim. Connective tissue ligaments stabilize both junctions during eyelid motion. These points establish the boundaries of the palpebral fissure.
The canthus helps keep the eye comfortable by guiding tears across the surface and preventing dryness. Its design supports proper lubrication and clear vision.
Understanding the anatomy of the eye helps explain how vision works and why each part is important for healthy sight. From the cornea that focuses light to the retina that captures images, every structure plays a precise role. Learning about these components encourages better eye care and awareness of changes that could signal a problem.
The inner canthus sits closest to the nose and contains structures linked to tear drainage, including the small openings that feed into the tear ducts. The outer canthus is the corner closest to the temple and helps define the eye's overall shape and eyelid angle. Both points help anchor eyelid tissue and support normal blinking.
Frame size and lens height can look different depending on eye shape, including the angle between the inner and outer corners. Some people have an epicanthal fold near the inner canthus, which can change how a bridge sits on the nose and how much space exists between the frame and the cheeks. Trying on several bridge styles and adjusting nose pads can improve comfort and keep the frame from touching sensitive areas near the eye corners.
This part of the eyelid system directs tears toward drainage openings called puncta. It also helps protect the eye by sealing the lids tightly when blinking. Healthy canthi prevent dryness and irritation. Swelling or redness in this area often signals infection or allergy. Regular cleaning and gentle care keep it in good condition.
Issues like inflammation or blocked tear ducts can affect the canthus. Mild cases respond to warm compresses and good hygiene. More severe infections may need medical drops. Persistent pain or discharge should be checked by an eye doctor. Early treatment prevents the problem from spreading to nearby tissue.
Surrounding structures include the tear ducts, conjunctiva, and small muscles that control eyelid movement. Together, they maintain smooth blinking and healthy tear flow. The canthus also helps anchor the eyelid margin for stability. Any imbalance can affect tear drainage or eye comfort. Keeping the area clean supports daily eye health.
Yes, bacteria or irritation can cause swelling.
“Human Eye.” Encyclopaedia Britannica. https://www.britannica.com/science/human-eye. Published December 29, 2025
“Eyelid Anatomy.” StatPearls. National Center for Biotechnology Information (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK546679/. Published May 22, 2023
“Anatomy of the Eye.” National Eye Institute (NEI). https://www.nei.nih.gov/learn-about-eye-health/healthy-vision/how-eyes-work. Published June 30, 2024
“Telecanthus.” Cleveland Clinic. https://my.clevelandclinic.org/health/diseases/24591-telecanthus. Published February 6, 2024
“Canthus.” Medical Subject Headings (MeSH). National Library of Medicine (NLM). https://meshb.nlm.nih.gov/record/ui?name=Canthus. Published July 1, 2025