Question
Which is the best diagnostic modality for this corneal condition
| A. |
Rose bengal dye
|
| B. |
Lissamine green stain
|
| C. |
Fluorescein dye with cobalt blue light
|
| D. |
Fluorescein dye with green filter
|
Show Answer
|
Correct Answer » C
Explanation
|
|
Fluorescein dye: An orange, water-soluble dye that highlights epithelial breakdown. Best viewed under cobalt blue light to diagnose dry eye disease, corneal defects & abrasions.
– Other Uses:
– Applanation tonometry
– Seidel’s test: Detects perforation & active leaks.
– Jones dye disappearance test: Checks nasolacrimal duct patency.
– Trauma to canaliculus: Used in eyelid trauma for canaliculus repair.
– Fundus angiography: Visualizes vascular pathologies (e.g., diabetic retinopathy).
– Cobalt blue excitation filter: Enhances fluoresein imaging.
– Yellow-green barrier filter: Blocks reflected blue light & allows yellow-green light through.
– Contact lens fitting
Rose Bengal dye: Evaluates mucin layer integrity; stains damaged epithelium & mucus.
Lissamine Green dye: Diagnoses dry eye, especially in Sjogren’s syndrome. Assesses contact lens fit & detects conjunctival staining.
