How much does the base curve (BC), overall diameter (OAD), prism or segment height have to change in order to be effective?
To make a significant fitting difference, the base curve should be changed a minimum of 0.50D or 0.05mm and the power adjusted accordingly. OAD should be changed a minimum of 0.3 mm. A general rule of thumb is a 0.5mm change in OAD results in a 0.25D diopter change in sagittal depth. Prism should be changed a minimum of 0.50D . Segment height should be raised or lowered a minimum of 0.3 mm.
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