Myopia Control Dose Delivered to Treated Eyes by a Dual Focus Myopia Control Contact Lens

Viswanathan Ramasubramanian, Nicola S Logan, Susie Jones, Dawn Meyer, Matt Jaskulski, Martin Rickert, Paul Chamberlain, Baskar Arumugam, Arthur Bradley, Pete S Kollbaum

Research output: Contribution to journalArticlepeer-review


SIGNIFICANCE: Consistent with closed loop models of regulated eye growth, a successful dual-focus (DF) myopia control contact lens focused a significant proportion of light anterior to the central retina in eyes of treated children viewing near and distant targets.

PURPOSE: This study examined the optical impact of a DF contact lens during near viewing in a sample of habitual DF lens wearing children.

METHODS: Seventeen myopic children aged 14 to 18 years who had completed 3 or 6 years of treatment with a DF contact lens (MiSight 1 day, CooperVision, Inc.) were recruited and fit bilaterally with the DF and a single vision (SV, Proclear 1 day, CooperVision, Inc.) contact lens. Right eye wavefronts were measured using a pyramidal aberrometer (Osiris, CSO) while children accommodated binocularly to high contrast letter stimuli at 5 target vergences. Wavefront error data were used to compute pupil maps of refractive state.

RESULTS: During near viewing, children wearing SV lenses accommodated on average to achieve approximate focus in the pupil center but due to combined accommodative lag and negative spherical aberration experienced up to 2.00 D of hyperopic defocus in the pupil margins. With DF lenses, children accommodated similarly achieving approximate focus in the pupil center. When viewing three near distances (0.48, 0.31 and 0.23 m), the added +2.00 D within the DF lens treatment optics shifted the mean defocus from +0.75 D to -1.00 D. The DF lens reduced the % of hyperopic defocus (≥ +0.75 D) in the retinal image from 52% to 25% over these target distances, leading to an increase in myopic defocus (≤ -0.50 D) from 17% to 42%.

CONCLUSIONS: The DF contact lens did not alter the accommodative behavior of children. The treatment optics introduced myopic defocus and decreased the amount of hyperopically defocused light in the retinal image.

Original languageEnglish
JournalOptometry and vision science : official publication of the American Academy of Optometry
Early online date24 Apr 2023
Publication statusE-pub ahead of print - 24 Apr 2023

Bibliographical note

Copyright © 2023 The Author(s). Published by Wolters Kluwer Health, Inc. on behalf of the American Academy of Optometry. This is an open-access article distributed under the terms of the Creative Commons Attribution-Non Commercial-No Derivatives License 4.0 (CC BY-NC-ND), where it is permissible to download and share the work provided it is properly cited. The work cannot be changed in any way or used commercially without permission from the journal.


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