Fig. 4.

Formation of participant-specific optics of the human eye. (A) The anatomical image is matched to the T2/GRIN image of the same lens, and the optical centre (dotted red line) is marked as the centre of connecting all vertices of contour (black *). This connected path is used to separate the lens anterior and posterior sections. (B) Geometrical parameters of the lens include anterior radius and thickness (Ra and Ta), posterior radius and thickness (Rp and Tp) and full lens thickness (Tap). (C) Sagittal GRIN profiles taken from the GRIN maps are fitted into ZEMAX GRIN3 formula. The optical centre is used to split GRIN profiles to avoid discontinuity. (D) Schematic drawing of the eye model in ZEMAX combining respective geometry and GRIN. The lens is modelled as a doublet split around the optical centre into anterior and posterior surfaces. The spectacle surface was used to estimate the spherical equivalent error.