A 25–year old male gives a history of redness, pain and mild diminished vision in one eye for past 3 days. There is also a history of a low backache for the past one year. On examination, there is circumcorneal congestion, the cornea is clear apart from a few fine keratic precipitates on the corneal endothelium, there are 2+ cells in the anterior chamber and the intraocular pressure is within normal limits. The patient is most likely suffering from –

**Core Concept**
The patient's presentation suggests an inflammatory condition affecting the eye, likely involving the uvea. The presence of keratic precipitates, circumcorneal congestion, and cells in the anterior chamber points towards uveitis. The patient's history of low backache may be related to the underlying cause of uveitis.

**Why the Correct Answer is Right**
The patient's symptoms and examination findings are consistent with anterior uveitis, specifically anterior non-granulomatous uveitis. The presence of keratic precipitates on the corneal endothelium and cells in the anterior chamber indicates an inflammatory response within the anterior segment of the eye. The normal intraocular pressure and clear cornea apart from the keratic precipitates further support this diagnosis. The patient's history of low backache may be related to ankylosing spondylitis, a systemic condition that can cause uveitis.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not match the patient's presentation. The patient has clear cornea and normal intraocular pressure, making this option less likely.
**Option B:** This option is incorrect as it does not account for the patient's history of low backache. The patient's symptoms and examination findings are more consistent with uveitis than glaucoma.

**Clinical Pearl / High-Yield Fact**
Uveitis can be a manifestation of systemic conditions such as ankylosing spondylitis, reactive arthritis, and sarcoidosis. A thorough systemic evaluation is essential to identify the underlying cause of uveitis.

**Correct Answer:** C. Anterior non-granulomatous uveitis

✓ Correct Answer: B. HLA B–27 related anterior uveitis