A 25 year old person sustained injury in right eye. He developed right corneal opacity following the injury. Left eye was already having poor vision. Corneoplasty of right eye was done and vision was restored. Medicolegally such injury is labelled as:

**Core Concept**
The question revolves around the concept of **monocular vision loss** and its medicolegal implications, particularly in the context of an injury leading to **corneal opacity** and subsequent **corneoplasty** (keratoplasty) to restore vision. Understanding the legal definitions of blindness and vision loss is crucial.

**Why the Correct Answer is Right**
Given that the left eye already had poor vision and the injury to the right eye led to corneal opacity, which was then surgically corrected, the scenario describes a situation where an individual's only seeing eye was compromised. The legal term for such a condition, where an individual has vision in only one eye or has lost the use of one eye, is important for determining compensation and legal rights.

**Why Each Wrong Option is Incorrect**
**Option A:** This choice is incorrect because it does not accurately describe the situation of having vision in only one eye due to injury.
**Option B:** Similarly, this option does not apply as it does not correctly represent the medicolegal term for the described condition.
**Option C:** This option is also incorrect as it does not match the legal definition relevant to the scenario provided.
**Option D:** This choice is not the correct term for the condition resulting from the injury and subsequent surgical restoration of vision.

**Clinical Pearl / High-Yield Fact**
In medicolegal contexts, the term **"monocular vision"** refers to having usable vision in only one eye. This distinction is crucial for legal and insurance purposes, especially in cases of workplace injuries or accidents leading to vision loss.

**Correct Answer:** D. Monocular Vision

✓ Correct Answer: A. Grievous