A technician wishes to produce the lens +2.00DS/+2.00DC x90 in toric form, in CR39 (n=1.498)with a -5.00 base curve. After finishing the toroidal surface with the CR39 tool it is discovered that, in error, they have used a plastics material of refractive index 1.56. Which CR39 tool must now be used to work the front surface?
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The technician must now use a CR39 tool with a -4.50 base curve to work the front surface.
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