Podcast
Questions and Answers
What type of cataract lies directly under the lens capsule?
What type of cataract lies directly under the lens capsule?
- Posterior nuclear cataract
- Anterior subcapsular cataract (correct)
- Cortical cataract
- Posterior subcapsular opacity
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?
- Posterior nuclear cataract
- Posterior subcapsular opacity (correct)
- Cortical cataract
- Anterior subcapsular cataract
What is the main visual symptom associated with posterior subcapsular opacities?
What is the main visual symptom associated with posterior subcapsular opacities?
- Glare from bright lights (correct)
- Color blindness
- Blurred vision
- Double vision
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?
Why does a posterior subcapsular opacity have a profound effect on vision?
Why does a posterior subcapsular opacity have a profound effect on vision?
Flashcards
Anterior Subcapsular Cataract
Anterior Subcapsular Cataract
A cataract located directly beneath the lens capsule on the anterior side.
Posterior Subcapsular Opacity
Posterior Subcapsular Opacity
An opacity located just in front of the posterior capsule, appearing black and vacuolated when viewed with retroillumination.
Glare From Bright Lights (Posterior subcapsular opacities)
Glare From Bright Lights (Posterior subcapsular opacities)
Increased sensitivity to bright lights causing scattering of the light and reduced vision.
Lens Epithelial Cells (Posterior Opacities)
Lens Epithelial Cells (Posterior Opacities)
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Impact of Posterior Subcapsular Opacity on Vision
Impact of Posterior Subcapsular Opacity 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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