This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: Cornea and sclera, Subject name: Ophthalmology
Prominent corneal nerves are seen in all except - 
Select and explain. 
A. Ectodermal dysplasia, B. Ichythyosis, C. Refsum's syndrome, D. Macular dystrophy
D: Macular dystrophy
Answer: D: Macular dystrophy 
Explanation: Macular dystrophy (Groenouw type-II)It is an autosomal recessive dystrophy characterisedby appearance of dense grey opacity in the centralcornea. The condition results due to accumulation ofmucopolysaccharides owing to a local enzymedeficiency. It occurs in childhood (5 to 10 years) andleads to marked defective vision in early life, whichusually requires penetrating keratoplasty. REF:Comprehensive ophthalmology,AK Khurana,4th edition,pg no.118.