15161 - Retinoscopy Rack The racks include + and - lenses: 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 5, 6, 7, 8, 9, 10, 12, 15 Gulden Ophthalmics Lens Racks are the most popular configurations for trial lenses. Included are high quality lenses in the specified powers, depending on the kind of rack selected. Retinoscopy Rack Optimetrics. From -0.10 to +10