ZABBYS TRIAL LENS SET Z-TRIALSET Trail Lens Set (Illuminated) is made of high quality lens with a group portability of lens. It contains Plano-convex, plano-concave, bi-convex and bi-conclave. These Trial Lens Sets are used to check the effective power of eye and give an exact report for judging the eye sight. Contents 32 Pairs Each cx and cc sph 0.25 to 4.00 in 0.25 Steps 4.50 to 6.00 in 0.50 Steps 7.00 to 14.00 in 1.00 Steps 16.00 to 20.00 in 2.00 Steps 20.00 Pairs Each cx and cc cyl 0.25 to 3.50 in 0.25 Steps 4.00 to 6.00 in 0.50 Steps Prisms 1/2.1, 2, 3, 4, 5, 6, 8, 10, 12 Accessories Maddox rod Stenopaic slit Red glass Pinhole 2 blank discs Green glass