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What Is Telecanthus?

Telecanthus is a physical finding where the distance between the inner corners of the eyelids (the medial canthi) is abnormally increased. It is important to note that in telecanthus, the eyes themselves (the pupils) are at a normal distance apart, and the bony orbits are correctly positioned. The issue is strictly with the soft tissue or the attachment of the eyelids to the nose. This creates the appearance of wide-set eyes, even though the underlying skeletal structure of the eye sockets is standard.

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What Is Telecanthus?

Telecanthus is a physical finding where the distance between the inner corners of the eyelids (the medial canthi) is abnormally increased. It is important to note that in telecanthus, the eyes themselves (the pupils) are at a normal distance apart, and the bony orbits are correctly positioned. The issue is strictly with the soft tissue or the attachment of the eyelids to the nose. This creates the appearance of wide-set eyes, even though the underlying skeletal structure of the eye sockets is standard.

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Telecanthus vs. Hypertelorism

While these two terms are frequently confused, they describe very different anatomical issues. In telecanthus, only the inner corners of the eyes are far apart while the interpupillary distance (the distance between the pupils) remains normal. Conversely, hypertelorism involves the actual bony orbits or eye sockets being spaced too far apart. This results in an increased distance between both the pupils and the inner corners. In simpler terms, telecanthus is a "fleshy" or tendon-based width, whereas hypertelorism is a skeletal width.

The Role of the Medial Canthal Tendon

The position of the inner corner of the eye is maintained by the Medial Canthal Tendon (MCT). This tendon anchors the eyelids to the bridge of the nose. Telecanthus occurs when this tendon is either congenitally long, poorly attached, or physically detached due to injury. When the tendon loses its tension, the inner corners of the eyes drift outward, leading to a flattened appearance of the nasal bridge and a reduction in the visible "white" of the eye near the nose.

Common Causes: Trauma and Syndromes

Telecanthus can be present from birth or acquired later in life. Traumatic telecanthus is most commonly seen following Naso-Orbito-Ethmoid (NOE) fractures, which are serious facial injuries often resulting from car accidents or blunt force. The fracture displaces the bone where the tendon attaches, causing the eye corners to widen. The condition is also a hallmark of several congenital syndromes. These include Waardenburg Syndrome, which is associated with hearing loss and pigment changes, and Blepharophimosis Syndrome (BPES), which involves drooping lids and small eye openings.

Surgical Repair: Canthopexy

Because telecanthus involves a structural displacement of tendons or bone, it cannot be corrected with non-invasive treatments. Surgical correction, known as Medial Canthopexy, is required. This involves identifying the medial canthal tendon and re-anchoring it to the bone?or to the tendon of the opposite eye?using specialized wires or permanent sutures. If a bone fracture is involved, the surgeon may need to use small titanium plates to stabilize the area before the tendon can be repositioned.

FAQs on Telecanthus

Does it affect my vision?

Telecanthus itself does not usually change how well you see. However, because it alters the eyelid position, it can interfere with the drainage of tears, leading to chronic watery eyes (epiphora) or a slightly increased risk of eyelid infections.

Is it just a cosmetic issue?

In many congenital cases, the primary concern is cosmetic. However, if the condition is caused by trauma, it is often associated with more serious internal injuries to the tear ducts or the sinuses that require medical attention.

Can it be fixed with "cat-eye" surgery?

No. Standard cosmetic "cat-eye" or fox-eye surgery focuses on the outer corner of the eye (lateral canthus). Telecanthus repair is a more complex reconstructive procedure focusing exclusively on the inner corner.

When to See Your Eye Doctor

If you experience a facial injury and notice that the shape of your eyes has changed or that the bridge of your nose looks wider than before, you should see an oculoplastic specialist. They will perform measurements to determine if the medial canthal tendon has been displaced.

References

https://eyewiki.aao.org/Medial_Canthal_Tendon_Injury https://pubmed.ncbi.nlm.nih.gov/28624177/ https://www.sciencedirect.com/topics/medicine-and-dentistry/telecanthus https://www.plasticsurgery.org/reconstructive-procedures/facial-trauma