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Title
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Retinal shadows produced by myopia control spectacles
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Author
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Abstract
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| Purpose: To analyse ocular coherence tomography (OCT) images of the retinal shadows caused by defocus and diffusion optics spectacles. Methods: One eye was fitted successively with the Hoya Defocus Incorporated Multiple Segments (DIMS) spectacle lens, two variations of the +3.50 D peripheral add spectacle (DEFOCUS) and the low-contrast dot lens (Diffusion Optics Multiple Segments, DOMS); each at a vertex distance of 12 mm. Simultaneously, a retinal image of the macular region with central fixation was obtained using infrared OCT. The corneal power and intraocular distances were determined using an optical biometer. Results: The retinal images for the DIMS and DOMS lenses showed patterns of obvious retinal shadows in the periphery, while the central 10-11 degrees remained clear. The DEFOCUS lens produced a darkened peripheral area. Dividing the size of the retinal pattern, measured with the calliper of the OCT software, by the actual size on the spectacle lens gave a magnification of 0.57 times. Based on the ocular biometry, the magnification of the retinal patterns was estimated at 0.46 times, meaning that the shadows in the OCT images were slightly further away from the fovea than where the wearer would observe them. The source of this discrepancy was probably the angle of the scanning OCT beam, which was not parallel to the optical axis. Conclusion: With device-specific correction, retinal OCT images can help visualise the regions affected by the defocus or lowered contrast induced by myopia control spectacles. This is of potential value for improving myopia therapies. |
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Language
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English
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Source (journal)
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Ophthalmic and physiological optics. - Guildford
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Publication
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Hoboken
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Wiley
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2023
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ISSN
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0275-5408
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DOI
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10.1111/OPO.13228
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Volume/pages
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44
:1
(2023)
, p. 214-218
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ISI
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001065136400001
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Pubmed ID
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37642972
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Full text (Publisher's DOI)
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Full text (open access)
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Full text (publisher's version - intranet only)
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