What is the defining finding of ectopia lentis et pupillae?

Lens and pupil displaced in roughly opposite directions Both structures are displaced bilaterally, and the lens moves one way while the pupil shifts roughly the opposite way, a pattern that points straight to this diagnosis.

A centred pupil with a unilaterally subluxed lens

Bilateral upward lens displacement with a round pupil

A displaced pupil with the lens in normal position

What underlying defect is thought to produce ectopia lentis et pupillae?

A defect affecting zonules and the developing iris together The opposite-direction pattern is thought to reflect a defect affecting both the zonular apparatus supporting the lens and the developing iris and pupillary structures during embryogenesis.

Failure of the embryonic hyaloid vasculature to regress

Persistent anterior chamber mesenchyme across the angle

Incomplete closure of the embryonic optic fissure

How is ectopia lentis et pupillae inherited?

Autosomal recessive Ectopia lentis et pupillae follows an autosomal recessive inheritance pattern, which is one feature separating it from dominantly inherited Marfan syndrome.

Mutations in which gene cause ectopia lentis et pupillae in many affected families?

ADAMTSL4 ADAMTSL4 encodes a protein of the microfibrillar network that also contains fibrillin, linking the condition mechanistically to other zonular and connective tissue disorders.

Besides being displaced, how does the pupil often appear in ectopia lentis et pupillae?

Irregular in shape or poorly reactive The pupil is frequently irregular or poorly reactive as well as displaced, reflecting the associated iris developmental abnormality.

Fixed and widely dilated in both eyes

Perfectly round but sluggishly reactive

Occluded by a dense fibrotic membrane

Which refractive finding is common in ectopia lentis et pupillae?

High myopia High myopia is common, arising both from the underlying connective tissue abnormality and from the altered optics of a displaced lens.

Which complication requires ongoing surveillance in ectopia lentis et pupillae?

Retinal detachment The risk of retinal detachment is raised by the high myopia and the zonular and vitreous abnormalities of the underlying connective tissue defect.

Central retinal artery occlusion

Proliferative diabetic retinopathy

How does ectopia lentis et pupillae differ systemically from Marfan syndrome and homocystinuria?

It is not typically associated with significant systemic findings Unlike Marfan syndrome and homocystinuria it usually has no significant systemic features, though systemic evaluation is still appropriate to exclude an alternative diagnosis.

It causes a milder but generalised skeletal phenotype

It involves the cardiovascular system but spares the skeleton

It produces a metabolic acidosis detectable in urine

Which examination step best demonstrates the extent of lens subluxation in ectopia lentis et pupillae?

Examining with the pupil pharmacologically dilated Slit-lamp examination through a dilated pupil allows full assessment of lens position and the extent of subluxation alongside the pupillary displacement.

Gonioscopy of the inferior angle

Measuring corneal diameter with calipers

Assessing the red reflex at one metre

What makes lens surgery technically demanding in ectopia lentis et pupillae?

Compromised and asymmetric zonular support Lens removal with intraocular lens fixation often needs specialised techniques because zonular support is both weakened and asymmetric in these eyes.

An abnormally shallow anterior chamber

Dense corneal opacity over the visual axis

An unusually small and rigid pupil aperture

Ectopia Lentis et Pupillae: Presentation & Care

Ectopia lentis et pupillae is a rare, bilateral, autosomal recessive condition defined by a very specific and distinctive finding: the lens and the pupil are each displaced, but in opposite directions from one another, a pattern that is genuinely unusual and immediately points toward this specific diagnosis when recognized.

The Defining Feature

In most causes of lens subluxation, the pupil remains centered even as the lens moves off-axis.

In ectopia lentis et pupillae, both structures are displaced, and characteristically the lens moves in one direction while the pupil is displaced in the roughly opposite direction, an unusual and specific pattern thought to reflect an underlying defect affecting both the zonular apparatus supporting the lens and the developing iris and pupillary structures simultaneously during ocular embryogenesis.

Genetics

Ectopia lentis et pupillae is inherited in an autosomal recessive pattern, and mutations in the ADAMTSL4 gene, which encodes a protein involved in the microfibrillar network that also includes fibrillin, have been identified as a cause in a substantial proportion of affected families, connecting this condition mechanistically to the broader family of zonular and connective tissue disorders that includes Marfan syndrome, even though ectopia lentis et pupillae itself is a genetically and clinically distinct entity.

Test your knowledge 10 questions from this article

Clinical Features

Bilateral lens subluxation, with the direction and degree of displacement often similar, though not always perfectly symmetric, between the two eyes
Pupillary displacement in a direction roughly opposite to the lens displacement, the defining and most distinctive feature of the condition
The pupil is often also irregular in shape or poorly reactive, reflecting the associated iris developmental abnormality
High myopia is common, related both to the underlying connective tissue abnormality and to the altered optics from lens displacement
Increased risk of retinal detachment, related to the high myopia and to zonular and vitreous abnormalities associated with the underlying connective tissue defect
Unlike Marfan syndrome and homocystinuria, ectopia lentis et pupillae is not typically associated with significant systemic findings, though a careful systemic evaluation is still appropriate to exclude overlap or an alternative diagnosis

Diagnosis

Diagnosis is based on recognizing the characteristic bilateral, opposite-direction displacement of the lens and pupil on slit-lamp examination, ideally with the pupil dilated to fully assess the position and extent of lens subluxation.

Because other causes of ectopia lentis, including Marfan syndrome, homocystinuria, and Weill-Marchesani syndrome, can sometimes present with subtle pupillary irregularity as well, a careful systemic evaluation, family history, and, when appropriate, genetic testing help confirm ectopia lentis et pupillae specifically and exclude these other conditions, which carry different systemic implications and management priorities (see ectopia lentis differential diagnosis).

Management

Clinical eye photograph illustrating Ectopia Lentis et Pupillae

Refractive Correction

Spectacle or contact lens correction of the often high and irregular refractive error is a first step, though the displaced lens and irregular pupil can make achieving good corrected vision challenging with optical correction alone in more significantly displaced cases.

Monitoring

Regular follow-up is needed to monitor for progression of lens subluxation, development of lens-induced complications such as cataract or lens-related glaucoma, and, importantly, surveillance for retinal detachment given the elevated risk associated with the high myopia and underlying connective tissue abnormality.

Surgical Management

When lens subluxation significantly compromises vision, cannot be adequately corrected optically, or is complicated by cataract or dislocation into the vitreous, surgical lens removal with appropriate intraocular lens fixation, often requiring specialized techniques given the abnormal zonular support, is considered.

Surgery in these eyes can be more technically demanding than routine cataract surgery, given the compromised and asymmetric zonular support, and often benefits from surgeons experienced in complex lens subluxation cases.

Prognosis

Visual outcomes vary depending on the severity of lens and pupillary displacement, the degree of associated refractive error, and whether complications such as retinal detachment develop over time.

With appropriate optical correction, surgical intervention when needed, and ongoing surveillance for retinal complications, many patients maintain functional, useful vision, though lifelong ophthalmic follow-up is appropriate given the chronic nature of the underlying zonular and connective tissue abnormality.

References

Neuhann T, Kalpadakis P, Rabinowitz YS. Ectopia lentis et pupillae. J Cataract Refract Surg. 1998;24:1379-1384.
Ahram DF, Sato TS, Kohlhase J, Colombani M, Ferguson RD, Levin AV. Additional evidence for ADAMTSL4 as a cause of isolated ectopia lentis. Ophthalmic Genet. 2015;36:65-69.
Goldberg MF. Clinical manifestations of ectopia lentis et pupillae in 16 patients. Ophthalmology. 1988;95:1080-1087.
Aragona P, Robotti S, Zaccheo A, et al. Molecular genetics of isolated ectopia lentis. Curr Genomics. 2015;16:401-406.

Test yourself

A few questions straight from this article.

1 / 10 0 correct

What is the defining finding of ectopia lentis et pupillae?
Both structures are displaced bilaterally, and the lens moves one way while the pupil shifts roughly the opposite way, a pattern that points straight to this diagnosis.
What underlying defect is thought to produce ectopia lentis et pupillae?
The opposite-direction pattern is thought to reflect a defect affecting both the zonular apparatus supporting the lens and the developing iris and pupillary structures during embryogenesis.
How is ectopia lentis et pupillae inherited?
Ectopia lentis et pupillae follows an autosomal recessive inheritance pattern, which is one feature separating it from dominantly inherited Marfan syndrome.
Mutations in which gene cause ectopia lentis et pupillae in many affected families?
ADAMTSL4 encodes a protein of the microfibrillar network that also contains fibrillin, linking the condition mechanistically to other zonular and connective tissue disorders.
Besides being displaced, how does the pupil often appear in ectopia lentis et pupillae?
The pupil is frequently irregular or poorly reactive as well as displaced, reflecting the associated iris developmental abnormality.
Which refractive finding is common in ectopia lentis et pupillae?
High myopia is common, arising both from the underlying connective tissue abnormality and from the altered optics of a displaced lens.
Which complication requires ongoing surveillance in ectopia lentis et pupillae?
The risk of retinal detachment is raised by the high myopia and the zonular and vitreous abnormalities of the underlying connective tissue defect.
How does ectopia lentis et pupillae differ systemically from Marfan syndrome and homocystinuria?
Unlike Marfan syndrome and homocystinuria it usually has no significant systemic features, though systemic evaluation is still appropriate to exclude an alternative diagnosis.
Which examination step best demonstrates the extent of lens subluxation in ectopia lentis et pupillae?
Slit-lamp examination through a dilated pupil allows full assessment of lens position and the extent of subluxation alongside the pupillary displacement.
What makes lens surgery technically demanding in ectopia lentis et pupillae?
Lens removal with intraocular lens fixation often needs specialised techniques because zonular support is both weakened and asymmetric in these eyes.

Ahmed Ophthalmologist

Writes and reviews the clinical articles on Educate. Every post is checked against peer-reviewed sources before it goes live.

Ectopia Lentis et Pupillae: A Rare Bilateral Mismatch Between Lens and Pupil