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Questions and Answers
What type of cataract lies directly under the lens capsule?
What type of cataract lies directly under the lens capsule?
Which type of opacity lies just in front of the posterior capsule and appears black and vacuolated on retroillumination?
Which type of opacity lies just in front of the posterior capsule and appears black and vacuolated on retroillumination?
What is the main visual symptom associated with posterior subcapsular opacities?
What is the main visual symptom associated with posterior subcapsular opacities?
Which type of cells contribute to the vacuoles seen in posterior subcapsular opacities?
Which type of cells contribute to the vacuoles seen in posterior subcapsular opacities?
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Why does a posterior subcapsular opacity have a profound effect on vision?
Why does a posterior subcapsular opacity have a profound effect on vision?
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Study Notes
Cataract Classification
- Anterior subcapsular cataract lies directly under the lens capsule.
- Anterior subcapsular cataract is associated with fibrous metaplasia of the lens epithelium.
Posterior Subcapsular Opacity
- Posterior subcapsular opacity lies just in front of the posterior capsule.
- Posterior subcapsular opacity has a granular or plaque-like appearance on oblique slit lamp biomicroscopy.
- Posterior subcapsular opacity typically appears black and vacuolated on retroillumination.
Characteristics of Posterior Subcapsular Opacity
- Posterior subcapsular opacity is caused by swollen migratory lens epithelial cells (bladder or Wedl cells).
- Posterior subcapsular opacity has a profound effect on vision due to its location at the nodal point of the eye.
- Symptoms of posterior subcapsular opacity include glare, particularly from oncoming headlights.
- Miosis, which occurs during near visual activity and in bright sunlight, increases symptoms of posterior subcapsular opacity.
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Description
Learn about the characteristics of anterior subcapsular and posterior subcapsular cataracts, including their appearance on slit lamp biomicroscopy and retroillumination. Understand how fibrous metaplasia of lens epithelium is associated with anterior subcapsular cataracts.
