Definition

The palpebral slant is the direction of the slant of a line that goes from the outer corner of the eye to the inner corner.

Alternative Names

Mongolian slant

Considerations

The word palpebral refers to the upper and lower eyelids, which help determine the shape of the eye. A line drawn from the inner corner to the outer corner determines the slant of the eye, or palpebral slant. Slanting and a fold of skin (epicanthal fold) are normal in people of Asian descent.

Abnormal slanting of the eye may occur with some genetic disorders and syndromes. The most common of these is Down syndrome. People with Down syndrome often also have an epicanthal fold in the inner corner of the eye.

Causes

Palpebral slant may not be due to any defect. However, in some cases, it may be due to:

• Down syndrome
• Fetal alcohol syndrome
• Certain genetic disorders

When to Contact a Medical Professional

Contact your health care provider if:

• Your infant has abnormal features of the face
• You are worried about your infant's ability to move their eyes
• You notice any abnormal color, swelling, or discharge from your infant's eyes

What to Expect at Your Office Visit

Your provider will perform a physical exam and ask questions about your child's medical history and symptoms.

An infant with an abnormal palpebral slant that is due to a problem will usually have other symptoms of another health condition. That condition will be diagnosed based on a family history, medical history, and a physical exam.

Tests to confirm a disorder may include:

• Chromosome studies
• Enzyme assays
• Metabolic studies
• X-rays

References

Kataguiri P, Kenyon KR. Corneal and external eye manifestations of systemic disease. In: Yanoff M, Duker JS, eds. Ophthalmology. 6th ed. Philadelphia, PA: Elsevier; 2023:chap 4.25.

Madan-Khetarpal S, Arnold G, Ortiz D. Genetic disorders and dysmorphic conditions. In: Zitelli BJ, McIntire SC, Nowalk AJ, Garrison J, eds. Zitelli and Davis' Atlas of Pediatric Physical Diagnosis. 8th ed. Philadelphia, PA: Elsevier; 2023:chap 1.

Orge FH. Examination and common problems in the neonatal eye. In: Martin RJ, Fanaroff AA, Walsh MC, eds. Fanaroff and Martin's Neonatal-Perinatal Medicine. 11th ed. Philadelphia, PA: Elsevier; 2020:chap 95.

Slavotinek AM. Dysmorphology. In: Kliegman RM, St. Geme JW, Blum NJ, Shah SS, Tasker RC, Wilson KM, eds. Nelson Textbook of Pediatrics. 21st ed. Philadelphia, PA: Elsevier; 2020:chap 128.