Table 1. Technical specifications of the contact lenses under study.

Parameters	Acuvue Oasys for presbyopia	Fusion 1d Presbyo	Biofinity multifocal
Replacement	2wk	Daily	Monthly
Water content (%)	38	60	48
Refractive index	1.42	1.42	1.40
BOZR (mm)	8.40	8.60	8.60
TD (mm)	14.30	14.10	14.00
DK/t (@ −3 D)	147	29	142
CT (mm) (@ −3 D)	0.07	0.07	0.09
Lens design	Concentric rings	Afocal	Asymmetric D and N
Manufacturer	Johnson & Johnson	Safilens	Cooper Vision

BOZR: Back optic zone radius; TD: Total diameter; DK/t: Oxygen transmissibility; CT: Central thickness.