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40 sphere lenses altogether (5 in each bar), 4 bars for each of concave (-) and convex (+).
0.00D -0.25D -0.50D -0.75D -1.00D -1.25D -1.50D -1.75D -2.00D -2.50D -3.00D etc. +0.25D +0.50D +0.75 +1.00D +1.25D +1.50D +1.75D +2.00D +2.25D +2.50D +2.75D etc.
Each Retinoscopy Rack Set contains four "racks," two plus and two minus sphere. Increments on the first rack are .50, 1.00, 1.50. 2.00, 2.50. 3.00. The second rack is comprised of 4.00, 5.00, 6.00, 7.00, 8.00, 10.00, 12.00. The easy carrying case is made of wood with a red felt and white silk lining.
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