Purpose: Presbyopic contact lens (CL) fittings produce simultaneous vision, providing different retinal images
that reduce visual quality and wearers’ satisfaction. The purpose of this study was to develop a new method to
isolate the multifocality effect of different CL options to manage presbyopia, analysing the impact on binocular
visual acuity (VA), stereopsis and contrast sensitivity (CS) and determining the effect of the use of a yellow filter
(YF) on visual function.
Methods: A prospective and double-masked randomized pilot study involving 20 healthy volunteers was conducted.
Four multifocal CLs and monovision CLs without far prescription were fitted. All subjects wore their
spectacles over the CLs to guarantee optimum VA at distance. Binocular VA, stereopsis and CS were assessed
after 20 min of CL wear with or without a YF of 455 nm.
Results: Binocular VA decreased with all multifocal CLs (P < 0.05), as did stereopsis (P < 0.01). All presbyopia
correction reduced CS compared with spectacles (P < 0.05), except aspheric designs, at a frequency of 3 cycles/°
(P > 0.06). Using the YF, visual function improved; better binocular VA was found with all multifocal CLs
(statistically significant (P < 0.02) with both low-addition designs), and better CS was observed at most spatial
frequencies (statistically significant (P < 0.02) at low frequencies with all CLs).
Conclusions: This pilot study proposes a simple method to analyse the impact of multifocal CL wear on VA, stereopsis
and CS while maintaining habitual spectacle correction to assess the patient’s short-term opinion and help
practitioners and patients make a decision during presbyopia correction with CL fitting.
