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
Coloured halos are seen in all, except – 
Select and explain. 
A. Cataract, B. Angle closure glaucoma, C. Corneal edema, D. Corneal opacity
D: Corneal opacity
Answer: D: Corneal opacity 
Explanation: Causes of coloured halos

Corneal edema
Glaucoma (elevated IOT)
Closed-angle glaucoma
Open-angle glaucoma
Early stages of cataract
Too intense exposure to light (snow blindness)
Vitreous opacities :- hemorrhage, asteroid bodies
Asymmetric placement of intraocular lens
Mucopurulent conjunctivitis
Epiphora
Hypoglycemia
Myopia
Foreign body
Drugs
Corticosteroids
Amiodarone
Digoxin
Chloroquine
OCPs