**Core Concept**
Painless loss of vision can be caused by various conditions affecting the eye, but some conditions are associated with pain due to increased intraocular pressure or other mechanisms. In this question, we are asked to identify the condition that is not typically associated with painless loss of vision.

**Why the Correct Answer is Right**
Acute Angle closure glaucoma is a medical emergency characterized by a sudden increase in intraocular pressure, which leads to severe eye pain, blurred vision, headache, and nausea. This condition is typically associated with pain and is not painless. The increased intraocular pressure causes damage to the optic nerve, leading to loss of vision. The pain is due to the stretching of the iris and the ciliary body, which is a result of the increased pressure.

**Why Each Wrong Option is Incorrect**
**Option A:** Vitreous hemorrhage can cause sudden painless loss of vision due to bleeding into the vitreous gel. This condition can be caused by trauma, diabetes, or retinal detachment.

**Option B:** Optic atrophy can cause painless loss of vision due to damage to the optic nerve. This can be caused by various conditions, including glaucoma, ischemia, or trauma.

**Option C:** Developmental cataract can cause painless loss of vision due to the clouding of the lens in the eye. This condition is present at birth or develops in early childhood.

**Clinical Pearl / High-Yield Fact**
When evaluating a patient with loss of vision, it is essential to ask about the presence or absence of pain. Painless loss of vision can be seen in conditions such as vitreous hemorrhage, optic atrophy, and developmental cataract. However, conditions like acute angle closure glaucoma are typically associated with pain and require urgent medical attention.

**✓ Correct Answer: D. Acute Angle closure glaucoma.**