This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Ophthalmology
Not a symptom of angle closure glaucoma – 
Select and explain. 
A. Blurring of vision, B. Coloured Halos, C. Metamorphosia, D. Headache
C: Metamorphosia
Answer: C: Metamorphosia 
Explanation: Transient blurring of vision and headache is seen in stage of constant instability.
Coloured halos are seen in acute congestive stage.