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, red glass, green glass, stenopaic slit, prinhole 2 blank discs