**Core Concept**
Vernal conjunctivitis is a type of allergic eye disease characterized by chronic inflammation of the conjunctiva, often associated with seasonal changes. It predominantly affects children and young adults, and is known for its severe symptoms, including photophobia, tearing, and a gritty sensation in the eyes.

**Why the Correct Answer is Right**
Trantas spots are small, white or yellowish dots that appear on the limbus, the border of the cornea and sclera, in patients with vernal conjunctivitis. These spots are actually collections of eosinophils, a type of white blood cell involved in allergic reactions. The presence of Trantas spots is a hallmark of vernal conjunctivitis and can aid in its diagnosis.

**Why Each Wrong Option is Incorrect**
**Option A:** Eczematous conjunctivitis is a type of conjunctivitis associated with eczema, but it does not typically present with Trantas spots.
**Option B:** Eczematous conjunctivitis is a distinct entity from vernal conjunctivitis and is not characterized by the presence of Trantas spots.
**Option C:** Ophthalmia nodosa is a rare form of conjunctivitis caused by the bite of a blackfly, and is not associated with Trantas spots.
**Option D:** Tularaemia is a bacterial infection caused by Francisella tularensis, and is not related to the presence of Trantas spots.

**Clinical Pearl / High-Yield Fact**
When diagnosing conjunctivitis, remember that Trantas spots are a specific finding associated with vernal conjunctivitis, and can help differentiate it from other forms of conjunctivitis.

**✓ Correct Answer: A. Vernal conjunctivitis**