Trial lens set 266 　 composition: 　spheres:40 pairs each of concave and convex 　0.25D to 6.00D in 0.25 steps 　6.50D to 10.00D in 0.50 steps 　11.00D to 15.00D in 1.00 steps 　16.00D to 20.00D in 2.00 steps 　Cylinders:20pairs each of concave and convex 　0.25D to 4.00D in 0.25 steps 　4.50D to 6.00D in 0.50 steps 　 Prisms:12 pieces 　0.5(2) 1.0 to 10.0 in 1.0 steps 　 Accessories:14 pieces 　RF GF BL PL(2) MR(2) FL CL(2) PH(2) SS PF Crosscylinder x0.25 x0.50