A 7-year old male child presents with normal vision 6/6 in the right eye and hand movement perception close to the face in the left eye. On fundoscopy, his right eye was normal and left eye showed retinal detachment, subretinal yellowish exudates and telangiectatic vessels. The most likely diagnosis is:

**Core Concept**
The case describes a young child with unilateral vision loss, retinal detachment, and characteristic fundoscopic findings, pointing towards a specific ocular condition. This condition is associated with abnormal blood vessel growth and leakage, leading to vision impairment.

**Why the Correct Answer is Right**
The clinical presentation, particularly the presence of subretinal yellowish exudates and telangiectatic vessels, is suggestive of Coats disease. This rare eye disorder is characterized by abnormal vascular growth and leakage within the retina, leading to retinal detachment and vision loss. The affected eye shows areas of retinal thinning, telangiectasia (abnormal dilated blood vessels), and exudates (fluid accumulation) under the retina. The disease primarily affects young males.

**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not applicable as it doesn't provide a diagnosis.
* **Option B:** Retinopathy of Prematurity (ROP) is a condition affecting premature infants, not typically a 7-year-old child.
* **Option C:** Leber Congenital Amaurosis is a group of rare genetic disorders affecting the retina, but it doesn't typically present with the described fundoscopic findings.
* **Option D:** This option is not provided, making it impossible to evaluate.

**Clinical Pearl / High-Yield Fact**
Coats disease is often unilateral and is more common in males, with a typical age of presentation between 5 to 10 years.

**Correct Answer:** A. Coats disease.

✓ Correct Answer: A. Coats' disease