Palpebral Fissure Slants
In the normal eye, the eyelids are generally positioned so that the lateral canthus is approximately 1 mm higher than the medial canthus. Slight upward or downward slanting of palpebral fissures normally occurs on a familial basis or in certain racial and ethnic groups (eg, Asians). An upward or downward slant is a characteristic feature of some craniofacial syndromes (eg, downward slant in Treacher Collins syndrome; see Chapter 18, Fig 18-9). Slanting of the palpebral fissures may be associated with A- or V-pattern strabismus (see Chapter 10).
Excerpted from BCSC 2020-2021 series: Section 10 - Glaucoma. For more information and to purchase the entire series, please visit https://www.aao.org/bcsc.