**Core Concept**
Traumatic cataract with secondary angle closure glaucoma is a potential complication of blunt ocular trauma, resulting in sudden vision loss and deep anterior chamber shallowing.

**Why the Correct Answer is Right**
The mechanism involves blunt trauma-induced lens dislocation, leading to pupillary block and subsequent angle closure glaucoma. This occurs when the lens-iris diaphragm is disrupted, allowing the lens to move forward and block the pupil, preventing aqueous humor outflow and causing a sudden increase in intraocular pressure. The deep anterior chamber is a result of the lens displacement and the subsequent blockage of aqueous humor outflow.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect as it does not directly relate to the sudden loss of vision and deep anterior chamber in the context of blunt trauma.
* **Option B:** This option is incorrect as it is more commonly associated with penetrating trauma rather than blunt trauma.
* **Option C:** This option is incorrect as it does not take into account the specific mechanism of lens dislocation and angle closure glaucoma in blunt ocular trauma.

**Clinical Pearl / High-Yield Fact**
In cases of blunt ocular trauma, it is essential to consider the possibility of lens dislocation and secondary angle closure glaucoma, even in the absence of obvious lens damage. A thorough examination, including pupillary dilation and gonioscopy, is crucial in diagnosing this condition.

**Correct Answer: C. Traumatic cataract with secondary angle closure glaucoma.**