Palpebral_fissure

Palpebral fissure

Palpebral fissure

The fissure separating the eyelids, defining the opening between them when the eyes are open

The palpebral fissure is the elliptic space between the medial and lateral canthi of the two open eyelids. In simple terms, it is the opening between the eyelids. In adult humans, this measures about 10 mm vertically and 30 mm horizontally.

Quick Facts Details, Synonyms ...

Variations

Congenital dysmorphisms

It can be reduced (short, "narrow") in horizontal size by fetal alcohol syndrome[1] and in Williams syndrome. The chromosomal conditions trisomy 9 and trisomy 21 (Down syndrome) can cause the palpebral fissures to be upslanted,[2] whereas Marfan syndrome can cause a downslant.[3] An increase in vertical height can be seen in genetic disorders such as cri-du-chat syndrome.

Acquired

The fissure may be increased in vertical height in Graves' disease, which is manifested as Dalrymple's sign. It is seen in disorders such as cri-du-chat syndrome.

In animal studies using four times the therapeutic concentration of the ophthalmic solution latanoprost, the size of the palpebral fissure can be increased. The condition is reversible. Latanoprost is a prostaglandin F receptor agonist.[4]

See also

References

  1. [1]
    "UNSW Embryo- Abnormal Development - Fetal Alcohol Syndrome". Retrieved 2007-12-23.
  2. [2]
    Kannan TP, Hemlatha S, Ankathil R, Zilfalil BA (2009). "Clinical manifestations in trisomy 9". Indian Journal of Pediatrics. 76 (7): 745–6. doi:10.1007/s12098-009-0158-2. PMID 19475342.
  3. [3]
    Loeys BL, Dietz HC, Braverman AC, Callewaert BL, De Backer J, Devereux RB, Hilhorst-Hofstee Y, Jondeau G, et al. (2010). "The revised Ghent nosology for the Marfan syndrome". Journal of Medical Genetics. 47 (7): 476–85. doi:10.1136/jmg.2009.072785. hdl:1854/LU-1013955. PMID 20591885.
  4. [4]
    United States Food and Drug Administration (Nov. 2006). Xalatan (latanoprost ophthalmic solution) 0.005% (50 μg/mL). Accessed 5 Feb 2011.
Share this article:

This article uses material from the Wikipedia article Palpebral_fissure, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.