Traumatic

Localized lens opacity caused by the glaucoma filtration tube trauma. 

  • Most common complication of non-perforating and perforating injuries to the globe.
  • Intraocular trauma by surgical instruments, lodged foreign body or intraocular filtration tube is also a possible cause.

Clinical features:

  • Cataract formation after non-perforating injuries such as contusion or concussion may occur without any damage to the lens capsule
  • The cataract formation may be slowly progressive or mature suddenly
  • It is not always easy to observe initial changes of the lens
  • Vossius' ring can be seen as circular iris pigment imprinted on the surface of the lens anterior capsule
  • Opacification can occur in a variety of lens structures resulting in discrete, punctate subepithelial changes, or deep in the cortex with the typical rosette (flower-shaped) opacity
  • Trauma may also produce anterior or posterior subcapsular opacities.