What is Sturm's Conoid?
Distance between two focal points created by differential refractive power of lens or cornea in different meridians.
Pattern of alignment of rays due to a cylindrical lens
Method of calculating IOL power
Tool in Diagnosis of Myopia
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
Elementary Optics