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Cornea & External Diseases

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Degenerations
Cogan's Senile Plaque

  • Normally occur in elderly people (after age 70).
  • Previously regarded as a focal hyalinization of the sclera.
  • Clinical features:
    • Symptoms: have no clinical significance
    • Signs:
      • Bilateral, symmetric, sharply demarcated vertically ovoid, or sometimes rectangular zones of increased scleral translucency
      • Commonly situated just in front of the medial and lateral recti
      • It may undergo calcification and become opaque white

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