Staphyloma

STAPHYLOMA


STAPHYLOMA

  •  Localized bulging of weak & thin outer tunic of eyeball (cornea or sclera), lined by uveal tissue.
  • Anterior staphyloma: an ectasia of pseudocornea (scar formed from organized exudates and fibrous tissue covered with epithelium) results after total sloughing of cornea, with iris plastered behind it.

  1. Intercalary staphyloma

  • Localized bulge in the limbus lined by root of iris
  • May be associated with secondary angle closure glaucoma

Causes:

  • Perforating injury
  • Peripheral corneal ulcer

  2. Ciliary staphyloma

  • Bulge of weak sclera 2-3mm away from limbus, lined by ciliary body.

Causes:

  • Perforating injury
  • Scleritis
  • Absolute glaucoma

  3. Equatorial staphyloma

  • Bulge of sclera lined by choroid in the equatorial region

Causes:

  • Scleritis,
  • Pathological myopia

  4. Posterior staphyloma

  • Bulge of sclera, lined by choroid, behind the equatorial region

Causes:

  • Degenerative high axial myopia
  • Posterior scleritis
  • Perforating injury
  5. Anterior Staphyloma:
  • Protrusion & adhesion of iris to ectatic cornea.
  • The most common cause is a sloughing corneal ulcer which perforates & heals with the formation of pseudocornea by the organisation of exudates & laying down of fibrous tissue.
  • Lined internally by iris.
Exam Question
 
  • Staphyloma is lined internally by uveal tissue (iris or ciliary body or choroid) .
  • Staphyloma involvement is Iris with Cornea.
  • Most common type of staphyloma in myopia is Posterior.
  • Most common cause of anterior staphyloma Corneal ulcer.
  • Most common cause of posterior staphyloma Myopia.
  • Posterior staphyloma is most commonly seen in Degenerative myopia.
  • Ciliary staphyloma is a complication of Scleritis.
Don’t Forget to Solve all the previous Year Question asked on STAPHYLOMA

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