The Jackson's Cross cylinder | Crack AIIMS, NEET NOV 2016 MCQs

The Jackson's Cross cylinder is a :

A. Sphero-cylindricalness 
B. Spherical lens
C. Cylindricalness 
D. Prismatic lens

Answer.A. Sphero-cylinderical lens

Jackson cylinder is a particular type of spherocylindrical lens used to determine both power and axis of astigmatic correction of an eye.

Jackson's cross cylinder test: It is used to verify the strength and axis of the cylinder prescribed.