**Core Concept**
The patient's symptoms of coloured haloes in the evening and blurring of vision for the last few days with normal 10P (intraocular pressure) suggest a condition where the pressure in the eye is not yet elevated but the drainage channels are being compromised. This is a characteristic feature of the prodromal phase of acute angle closure glaucoma.

**Why the Correct Answer is Right**
The prodromal phase of acute angle closure glaucoma is characterized by intermittent episodes of blurred vision, coloured haloes around lights, and eye pain, often triggered by near work or dim lighting. This occurs due to the partial closure of the trabecular meshwork, the drainage channels in the eye, which leads to a transient increase in intraocular pressure. The iris, being thicker in the afternoon, can partially close the angle between the iris and the trabecular meshwork, impeding aqueous humor outflow and resulting in symptoms.

**Why Each Wrong Option is Incorrect**
**Option B:** Acute angle closure glaucoma typically presents with a sudden onset of severe eye pain, redness, and a significantly elevated intraocular pressure, which is not the case here.

**Option C:** Chronic glaucoma, also known as open-angle glaucoma, is characterized by a slow and gradual increase in intraocular pressure, often asymptomatic in its early stages, and does not typically present with coloured haloes.

**Option D:** Epidemic dropsy is a condition caused by the consumption of mustard oil contaminated with oil extracted from the seeds of the guarana plant, which leads to a triad of symptoms: edema, hypertension, and glaucoma. The symptoms described do not match the typical presentation of epidemic dropsy.

**Clinical Pearl / High-Yield Fact**
The "haloes around lights" symptom is a classic red flag for acute angle closure glaucoma and should prompt a thorough examination and investigation to rule out this potentially sight-threatening condition.

**✓ Correct Answer: A. Prodromal phase of acute angle closure glaucoma**