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


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., San Ramon, CA) were recruited and fit bilaterally with the DF and a single-vision (Proclear 1 Day; CooperVision, Inc.) contact lens. Right eye wavefronts were measured using a pyramidal aberrometer (Osiris; CSO, Florence, Italy) while children accommodated binocularly to high-contrast letter stimuli at five target vergences. Wavefront error data were used to compute pupil maps of refractive state. RESULTS During near viewing, children wearing single-vision lenses accommodated on average to achieve approximate focus in the pupil center but, because of 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 to -1.00 D. The DF lens reduced the percentage 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.

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Divisions: College of Health & Life Sciences > School of Optometry > Optometry
College of Health & Life Sciences
College of Health & Life Sciences > School of Optometry > Vision, Hearing and Language
College of Health & Life Sciences > School of Optometry > Optometry & Vision Science Research Group (OVSRG)
Additional Information: 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.
Publication ISSN: 1538-9235
Last Modified: 13 Jun 2024 07:32
Date Deposited: 25 Jul 2023 17:41
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PURE Output Type: Article
Published Date: 2023-06-01
Published Online Date: 2023-04-24
Accepted Date: 2023-04-04
Authors: Ramasubramanian, Viswanathan
Logan, Nicola S (ORCID Profile 0000-0002-0538-9516)
Jones, Susie
Meyer, Dawn
Jaskulski, Matt
Rickert, Martin
Chamberlain, Paul
Arumugam, Baskar
Bradley, Arthur
Kollbaum, Pete S

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