Question
In Fincham’s test:
| A. |
Glaucomatous halo remains intact
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| B. |
Halo due to immature cataract does not break into segments
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| C. |
Mucopurulent conjunctivitis does not produse halo
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| D. |
All of the above
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Show Answer
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Correct Answer � A
Explanation
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Ans. Glaucomatous halo remains intact
- Fincham’s test is done using the staenopic slit to differentiate the colored haloes caused by cataract (lenticular) from that caused by glaucoma (corneal).
- Staenopic slit is moved across patient’s eye while the patient looks at a bright point source of light which gives rise to halo.
- The halo caused by cataract breaks into a fan the blades of which seem to move whereas the halo caused by glaucoma remains unchanged or just becomes a little faint.
- This is caused by peculiar disposition of the lens fibers which cause diffraction of light parallel to them.
- Mucopurulent conjunctivitis causes halos which disapper once the conjunctigitis resolves.
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