Ectopia lentis

Ectopia lentis refers to subluxation or dislocation of the lens of the eye secondary to dysfunction or disruption of zonular fibers. It is most commonly due to trauma. The commonest atraumatic etiologies are Marfan syndrome and homocystinuria.

Marfan syndrome, homocystinuria and Weil-Marchesani syndrome account for the vast majority of non-traumatic cases.

Sonographic features of lens malposition differ based upon the degree of luxation as follows 5:

  • subluxation
    • unilateral deviation of the lens margin posteriorly into the anechoic vitreous body
    • the contralateral margin remains fixed adjacent to the iris
  • complete luxation
    • the lens assumes a dependent position in the vitreous
    • demonstrates free mobility with eye movements

Associated findings include:

An anterior dislocation/subluxation carries greater complications than a posterior one. Such complications include:

Article information

rID: 1257
Synonyms or Alternate Spellings:
  • Dislocation of the lens
  • Lens dislocation
  • Lens subluxation
  • Subluxation of the lens

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Cases and figures

  • Case 1: ultrasound
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  • Case 2: from trauma
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  • Case 3: on right
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  • Case 4: on left
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  • Case 5: post trauma on right
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  • Case 6
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  • Case 7
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  • Case 8: post-traumatic
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  • Case 9
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