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Caption: Figure 2 Cornea and lens sagittal depth relationship
Typically, the BOZR is reduced (creating a steeper curve) to create a tighter fit to eye as a result of an increase in lens sagittal depth (sag), and increased to loosen the fit due to a decrease in lens sag.
He suggests measuring corneal height with topography or, better still, anterior segment OCT and thinking in terms of the sagittal depth or 'sag' of a soft lens.