Light disturbance with multifocal contact lens and monovision for presbyopia

Paulo Fernandes; Ana Amorim-de-Sousa; António Queirós; Santiago Escandón-Garcia; Colm McAlinden; José Manuel González-Méijome

doi:10.1016/j.clae.2018.03.006

Light disturbance with multifocal contact lens and monovision for presbyopia

Cont Lens Anterior Eye. 2018 Aug;41(4):393-399. doi: 10.1016/j.clae.2018.03.006. Epub 2018 Mar 22.

Authors

Paulo Fernandes¹, Ana Amorim-de-Sousa², António Queirós², Santiago Escandón-Garcia², Colm McAlinden³, José Manuel González-Méijome²

Affiliations

¹ Clinical and Experimental Optometry Research Laboratory (CEORLab) Center of Physics (Optometry), School of Sciences, University of Minho, Braga, Portugal. Electronic address: pfernandes@fisica.uminho.pt.
² Clinical and Experimental Optometry Research Laboratory (CEORLab) Center of Physics (Optometry), School of Sciences, University of Minho, Braga, Portugal.
³ University Hospitals Bristol, NHS Foundation Trust, Bristol, UK.

PMID: 29576438
DOI: 10.1016/j.clae.2018.03.006

Abstract

Dysphotopsia affects a significant number of patients, particularly after visual correction with multifocal optical designs.

Purpose: Evaluate light distortion (LD) in two modalities of contact lens (CL) wear: multifocal (MF) and monofocal (MV).

Methods: This was a randomized, double-masked, crossover study involving 20 presbyopic patients. Patients were randomized first into either MF or MV for 15 days of use with a 1 week wash-out period between each lens type. The LD was evaluated with the Light Distortion Analyzer (LDA, University of Minho) under monocular and binocular conditions. The light distortion index (LDI, %), among other parameters were analyzed. Subjective quality of vision was assessed with the Quality of Vision (QoV).

Results: The LD showed an increase in all parameters in both CL modalities being significant for MV in the non-dominant eye (p < 0.030, for all LD parameters). For the MF, there was also a significant increase in LDI (p = 0.016) and in BFCrad (p = 0.022) in the non-dominant eye. After 15 days of MF lens wear, there was a significant decrease in all LD parameters (p < 0.002) in the dominant eye. Binocularly, a significant improvement from 1 to 15 days was observed for LDI (p = 0.009) and BFCrad (p = 0.0013) with MF. The QoV questionnaire showed no significant changes with neither CL.

Conclusions: Adaptation to light disturbances induced by MF CL is more effective compared to MV. Practitioners will have greater success if they prepare their patients for the adaptation required as their vision will get better and have less of an issue with light disturbance.

Keywords: Contact lenses; Light disturbance; Monovision; Multifocal; Presbyopia.