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How to convert the corneal curvature value in the forties into the base arc? For contact lenses.
Base arc = (horizontal base arc+vertical base arc) /2X 1. 1

According to the data you provided, it is 8. 18@90 8.30@ 180.

Then (8.18+8.3)/2x1.1= 9064 mm.

Choose the base arc of 9.0, but 8.9 is easier to find, and you can find the best one with 9.0.

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