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Shouldnt the answer be option A
Reading File
analyse_media
No, the correct answer is D - Intraocular foreign body, and here is why:
The Sign: Vossius Ring
The image shows a Vossius ring - a circular ring of iris pigment imprinted on the anterior lens capsule at the pupillary margin. This is a pathognomonic sign of blunt ocular trauma.
Why D is Correct (the EXCEPT answer)
All the signs associated with blunt trauma should be expected - EXCEPT an intraocular foreign body:
| Option | Association with blunt trauma | Expected? |
|---|---|---|
| A - Cherry red spot | Blunt trauma can cause commotio retinae (Berlin's edema) - retinal whitening around the macula that makes the fovea appear as a cherry red spot | Yes, can be expected |
| B - Lens subluxation | Blunt trauma ruptures zonular fibers causing subluxation/dislocation | Yes, expected |
| C - Angle recession | Blunt trauma tears the ciliary muscle between longitudinal and circular fibers | Yes, expected |
| D - Intraocular foreign body | This results from penetrating/perforating trauma, NOT blunt trauma | NOT expected |
Why Option A is NOT the answer
A cherry red spot can indeed occur after blunt trauma through two mechanisms:
- Commotio retinae - the most common cause after blunt trauma (retinal opacification sparing the fovea)
- Traumatic central retinal artery occlusion - a recognized complication of severe blunt trauma
So a cherry red spot IS an expected finding after blunt trauma, meaning it does NOT fit the "EXCEPT" criterion.
The correct answer is D. An intraocular foreign body requires a penetrating injury - a Vossius ring tells you this was blunt, closed-globe trauma, making an IOFB very unlikely.
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