An Obliquely Crossed Cylinders Calculator is a specialized optical tool used to combine two spherocylindrical lens prescriptions into a single, resultant prescription. In other words, if you have two lenses—each with its own sphere, cylinder power, and axis—and you want to know what single lens power and orientation would replicate the net effect of stacking or combining those two lenses, our Obliquely Crossed Cylinders Calculator does precisely that.