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What is What is Sturm's Conoid? and explain in detail?
Ans. is 'a' i.e., Distance between two focal points created by differential refractive power of lens or cornea in different meridians o Sturm's Conoid:# It is an optical condition in which the refractive power of lens or cornea is not the same in all meridians, hence two focal points separated by a focal interval are formed which is called the Sturm's Conoid.o Etiology:A) Corneal Causes:# Astigmatism# KeratoconusB) Lenticular Causes:# Lenticonus# Congenital tilting of lens# Index astigmatism