Question
Pathology in the given image is?
| A. |
Simplex keratitis
|
| B. |
Bacterial keratitis
|
| C. |
Fungal keratitis
|
| D. |
Acanthamoeba keratitis
|
Show Answer
|
Correct Answer � D
Explanation
|
|
The image shows a large ring ulcer, typically described in Acanthamoeba keratitis, associated with contact lens users.
Risk Factors:
- Commonly seen in contact lens wearers ( if tap water is used to clean lens).
- Immunocompromised individuals.
- Following trauma.
- Acquired from the swimming pool.
- Orthokeratology.
Signs
- Typical reticular pattern.
- Radial keratoiritis-perineural infiltrates seen during the first 4 weeks-Pathognomonic sign.
- Pseudodendrites-mistaken with herpes simplex keratitis.
- Severe cases may have a central or paracentral ring-shaped lesion (Ring abscess) and hypopyon.
- Limbitis
Investigation
o Staining: Calcofluor white, acridine orange, lactophenol blue.
o Culture: Non-nutrient agar with Escherichia coli overlay.
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