How can we determine if ectopia lentis is genetic or due to an injury, and why is this distinction important?

Determining the cause involves a thorough medical history, including any head or eye trauma, and a detailed family history to check for other affected individuals. Genetic testing can identify pathogenic variants in genes like FBN1 or ADAMTSL4, confirming a genetic cause. This distinction is important for genetic counseling, understanding the risk of recurrence in future children, and ruling out other systemic conditions associated with ectopia lentis.

What are the typical treatment options for isolated ectopia lentis to improve vision and prevent complications?

Treatment often involves corrective lenses, such as glasses or contact lenses, to manage myopia, astigmatism, or double vision. In some cases, surgical intervention may be considered to reposition or remove the dislocated lens, especially if vision is severely impaired or complications like glaucoma or cataracts develop. Regular monitoring for increased intraocular pressure (glaucoma) and retinal tearing is also crucial.

What are the common early signs of isolated ectopia lentis in a child, and when should a parent seek an eye exam?

Common early signs include noticeable near-sightedness (myopia), double vision (diplopia), or general blurred vision. These symptoms may be present from birth or become apparent during childhood. Parents should seek an eye exam if they notice their child squinting excessively, holding objects very close to their face, complaining of blurry or double vision, or if there's any visible displacement of the pupil or iris.

What are the serious long-term complications of isolated ectopia lentis that require careful monitoring?

Serious long-term complications include the development of cataracts (clouding of the lens), increased intraocular pressure (glaucoma) which can damage the optic nerve, and retinal tearing or detachment, which can lead to severe vision loss or blindness. Regular comprehensive eye exams are essential to monitor for these complications and intervene promptly if they arise.

Isolated ectopia lentis

Isolated ectopia lentis is a genetic eye disorder that causes the lens to be displaced, leading to vision problems such as myopia and double vision.

Overview

Isolated ectopia lentis is a condition that affects the positioning of the lens in the eyes. The lens is a clear structure that helps focus light. In people with isolated ectopia lentis, the lens in one or both eyes is out of place (ectopic) instead of centrally positioned. It is often present at birth but may become apparent during childhood, and the lens may drift further out of place over time.

Symptoms

Common visual problems in individuals with isolated ectopia lentis include:

Near‑sightedness (myopia)
Double vision (diplopia)
Blurred vision due to irregular curvature of the lens or cornea (astigmatism)
Clouding of the lenses (cataract)
Increased intraocular pressure (glaucoma)
Tearing of the retina at the back of the eye, which can lead to further vision problems and blindness

Eye problems can vary among affected individuals, even within the same family.

Causes & Risk Factors

Changes in the FBN1 or ADAMTSL4 gene cause isolated ectopia lentis. Pathogenic variants in these genes produce proteins that are necessary for the formation of microfibrils. Microfibrils support many tissues, and within the eyes they form zonular fibers that hold the lenses in their central position. When pathogenic variants reduce the number or alter the structure of microfibrils, zonular fibers weaken and the lens becomes ectopic, leading to the vision problems described above.

Isolated ectopia lentis can also result from injury or trauma to the head or eye. Traumatic ectopia lentis is not genetic, can occur at any age, and is the most common cause of ectopia lentis.

Learn more about the genes associated with Isolated ectopia lentis

ADAMTSL4
FBN1

Inheritance

When isolated ectopia lentis is caused by pathogenic variants in the FBN1 gene, it is inherited in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In some cases, an affected person inherits the variant from . Other cases result from a in the gene that occurs during the formation of reproductive cells (eggs or sperm) in an affected individual's parent or during early embryonic development. These affected individuals typically have no history of the disorder in their family.

When isolated ectopia lentis is caused by mutations in the ADAMTSL4 gene, it is inherited in an , which means both copies of the gene in each cell must have a variant to cause the disorder. The parents of an individual with an autosomal recessive condition each carry one copy of the altered gene, but they typically do not show signs and symptoms of the condition.

Other Names for This Condition

Congenital ectopia lentis
Ectopia lentis
Lens subluxation
Subluxation of lens

Additional Information & Resources

Genetic Testing Information

Genetic Testing Registry: Ectopia lentis 2, isolated, autosomal recessive
Genetic Testing Registry: Ectopia lentis 1, isolated, autosomal dominant

Genetic and Rare Diseases Information Center

Isolated ectopia lentis

Patient Support and Advocacy Resources

National Organization for Rare Disorders (NORD)

Catalog of Genes and Diseases from OMIM

ECTOPIA LENTIS 1, ISOLATED, AUTOSOMAL DOMINANT; ECTOL1
ECTOPIA LENTIS 2, ISOLATED, AUTOSOMAL RECESSIVE; ECTOL2

Scientific Articles on PubMed

PubMed

References

Chandra A, Aragon-Martin JA, Hughes K, Gati S, Reddy MA, Deshpande C, Cormack G, Child AH, Charteris DG, Arno G. A genotype-phenotype comparison of ADAMTSL4 and FBN1 in isolated ectopia lentis. Invest Ophthalmol Vis Sci. 2012 Jul 24;53(8):4889-96. doi: 10.1167/iovs.12-9874.
Chandra A, Patel D, Aragon-Martin JA, Pinard A, Collod-Beroud G, Comeglio P, Boileau C, Faivre L, Charteris D, Child AH, Arno G. The revised ghent nosology; reclassifying isolated ectopia lentis. Clin Genet. 2015 Mar;87(3):284-7. doi:10.1111/cge.12358.
Chen TH, Chen ZX, Zhang M, Chen JH, Deng M, Zheng JL, Lan LN, Jiang YX. Combination of Panel-based Next-Generation Sequencing and Clinical Findings in Congenital Ectopia Lentis Diagnosed in Chinese Patients. Am J Ophthalmol. 2022 May;237:278-289. doi: 10.1016/j.ajo.2021.11.014.
Faivre L, Collod-Beroud G, Callewaert B, Child A, Loeys BL, Binquet C, Gautier E, Arbustini E, Mayer K, Arslan-Kirchner M, Kiotsekoglou A, Comeglio P, Grasso M, Beroud C, Bonithon-Kopp C, Claustres M, Stheneur C, Bouchot O, Wolf JE, Robinson PN, Ades L, De Backer J, Coucke P, Francke U, De Paepe A, Boileau C, Jondeau G. Pathogenic FBN1 mutations in 146 adults not meeting clinical diagnostic criteria for Marfan syndrome: further delineation of type 1 fibrillinopathies and focus on patients with an isolated major criterion. Am J Med Genet A. 2009 May;149A(5):854-60. doi: 10.1002/ajmg.a.32809.
Fuchs J, Rosenberg T. Congenital ectopia lentis. A Danish national survey. Acta Ophthalmol Scand. 1998 Feb;76(1):20-6. doi:10.1034/j.1600-0420.1998.760105.x.
Guo D, Jin G, Zhou Y, Zhang X, Cao Q, Lian Z, Guo Y, Zheng D. Mutation spectrum and genotype-phenotype correlations in Chinese congenital ectopia lentis patients. Exp Eye Res. 2021 Jun;207:108570. doi: 10.1016/j.exer.2021.108570.
Kaur K, Gurnani B. Ectopia Lentis. 2023 Jun 11. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2026 Jan-. Available from.
Rodahl E, Mellgren AEC, Boonstra NE, Knappskog PM. ADAMTSL4-Related Eye Disorders. 2012 Feb 16 [updated 2020 Jul 9]. In: Adam MP, Bick S, Mirzaa GM, Pagon RA, Wallace SE, Amemiya A, editors. GeneReviews(R) [Internet]. Seattle (WA): University of Washington, Seattle; 1993-2026.

MEDICAL ENCYCLOPEDIA

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Genetics

Understanding Genetics

What is the prognosis of a genetic condition?
How can gene variants affect health and development?
What does it mean if a disorder seems to run in my family?
What are the different ways a genetic condition can be inherited?
How are genetic conditions treated or managed?

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