We are offering retinoscopy rack.cat no. Ibl-3303 retinoscopy rack set : 4 rack retinoscopy lens set in wooden box these lens bars are not only great looking but allows you to make a quick refraction when used in conjunction with your retinoscope.content four wooden racks with a total of 28 lenses 0.50, 1.00, 1.50, 2.00, 2.50, 3.00, 3.50, 4.00, 5.00, 6.00, 7.00, 8.00, 9.00, 12.00d