Multifocal contact lens vision simulated with a clinical binocular simulator (2022)

Barcala, X. — Tue, 06 Dec 2022 15:19:14 +0000

Citation

Barcala, X., Vinas, M., Ruiz, S., Hidalgo, F., Nankivil, D., Karkkainen, T., Gambra, E., Dorronsoro, D., & Marcos, S.; Multifocal contact lens vision simulated with a clinical binocular simulator. Contact Lens and Anterior Eye 2022, 45(6):101716. For more information, click here.

Abstract

Purpose

The purpose of this study is to compare the binocular visual perception of participants wearing multifocal contact lenses and these same lens designs viewed through a temporal multiplexing visual simulator.

Methods

Visual performance and perceived visual quality at various distances were obtained in 37 participants wearing soft M−CLs and through the SimVis Gekko programmed with the same lenses. In a pilot study (n = 10) visual performance was measured in terms of LogMAR visual acuity (VA) at far (4 m), intermediate (64 cm) and near (40 cm) distances and through-focus VA (TFVA) curves with the simulated M−CLs. In the follow-up study (n = 27), LogMAR VA at far, intermediate and near distances were measured both with the actual and simulated M−CLs. Perceived visual quality was measured in both studies using the Multifocal Acceptance Score (MAS-2EV), and a Participants Reported Outcomes Vision questionnaire. Differences between the metrics obtained with simulated and actual lenses were obtained.

Results

Both actual and simulated M−CLs increased depth-of-focus by a similar amount. Mean LogMAR VA differences with actual and simulated M−CLs ranged between 4 and 6 letters (0.08 ± 0.01, 0.12 ± 0.01 and 0.10 ± 0.01, for far, intermediate and near distances, respectively). MAS-2EV average score differences with actual and simulated M−CLs ranged between −1.00 and + 4.25. Average MAS-2EV scores were not correlated significantly with VA. However, MAS-2EV (average and individual scores) were highly correlated to visual quality questionnaire responses (p < 0.005).

Conclusions

A simultaneous vision simulator accurately represented vision with M−CLs both VA at various distances and perceived visual quality, as measured in a clinical setting. The MAS-2EV metric accurately captured participant reported outcomes of standard vision questionnaires. The combination of SimVis Gekko and MAS-2EV has the potential to largely reduce chair time in M−CLs fitting.