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Firstly, to determine if eyes with spherical aberration (SA) that deviates significantly from the average level underperform when fitted with a simultaneous‐imaging contact lens (CL) with a power profile calculated for an ‘average eye’. Secondly, to determine if CL customisation can improve image quality in these eyes after fitting with a bifocal CL.

A statistical model of the wavefront aberration function of normal eyes was used to generate a vector of Zernike fourth‐order SA coefficients from 100 synthetic eyes. Four bifocal power profiles were modelled: centre‐near (CN) or centre‐distance (CD), and two‐zone or four‐zone. All designs had 0.1‐mm‐wide transition zones. Different levels of distance and add powers were modelled, using well‐established computational wave‐optics methods. Zone widths were optimised to obtain maximal multifocal efficiency (MFE), a metric based on the visual Strehl …