Predicting corneal refractive power changes after orthokeratology

Predicting corneal refractive power changes after orthokeratology

Abstract This study aimed to characterise corneal refractive power (CRP) changes along the principal corneal meridians during orthokeratology (OK). Nineteen myopes (mean age 28 ± 7 years) were fitted with OK lenses in both eyes. Corneal topography was captured before and after 14 nights of OK lens w...

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Autores principales: Pauline Kang, Vinod Maseedupally, Paul Gifford, Helen Swarbrick
Formato: article
Lenguaje:EN
Publicado: Nature Portfolio 2021
Materias:
Medicine
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Science
Q
Acceso en línea:https://doaj.org/article/0dfdd0f1767e4663acd7534c17da4d4f
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spelling oai:doaj.org-article:0dfdd0f1767e4663acd7534c17da4d4f2021-12-02T17:08:36ZPredicting corneal refractive power changes after orthokeratology10.1038/s41598-021-96213-x2045-2322https://doaj.org/article/0dfdd0f1767e4663acd7534c17da4d4f2021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96213-xhttps://doaj.org/toc/2045-2322Abstract This study aimed to characterise corneal refractive power (CRP) changes along the principal corneal meridians during orthokeratology (OK). Nineteen myopes (mean age 28 ± 7 years) were fitted with OK lenses in both eyes. Corneal topography was captured before and after 14 nights of OK lens wear. CRP was calculated for the central 8 mm cornea along the horizontal and vertical meridians. The central-paracentral (CPC) power ratio was calculated as the ratio between maximum central and paracentral CRP change from individual data. There was a significant reduction in CRP at all locations in the central 4 mm of the cornea (all p < 0.001) except at 2 mm on the superior cornea (p = 0.071). A significant increase in CRP was evident in the paracentral zone at 2.5, 3 and 3.5 mm on the nasal and superior cornea and at 3.5 and 4 mm on the temporal cornea (all p < 0.05). No significant change in CRP was measured in the inferior cornea except decreased CRP at 2.5 mm (p < 0.001). CPC power ratio in the nasal and temporal paracentral regions was 2.49 and 2.23, respectively, and 2.09 for both the inferior and superior paracentral corneal regions. Our results demonstrates that OK induced significant changes in CRP along the horizontal and vertical corneal meridians. If peripheral defocus changes are inferred from corneal topography, this study suggests that the amount of myopia experienced on the peripheral retina was greater than twice the amount of central corneal power reduction achieved after OK. However, this relationship may be dependent on lens design and vary with pupil size. CPC power ratios may provide an alternative method to estimate peripheral defocus experienced after OK.Pauline KangVinod MaseedupallyPaul GiffordHelen SwarbrickNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Pauline Kang
Vinod Maseedupally
Paul Gifford
Helen Swarbrick
Predicting corneal refractive power changes after orthokeratology
description Abstract This study aimed to characterise corneal refractive power (CRP) changes along the principal corneal meridians during orthokeratology (OK). Nineteen myopes (mean age 28 ± 7 years) were fitted with OK lenses in both eyes. Corneal topography was captured before and after 14 nights of OK lens wear. CRP was calculated for the central 8 mm cornea along the horizontal and vertical meridians. The central-paracentral (CPC) power ratio was calculated as the ratio between maximum central and paracentral CRP change from individual data. There was a significant reduction in CRP at all locations in the central 4 mm of the cornea (all p < 0.001) except at 2 mm on the superior cornea (p = 0.071). A significant increase in CRP was evident in the paracentral zone at 2.5, 3 and 3.5 mm on the nasal and superior cornea and at 3.5 and 4 mm on the temporal cornea (all p < 0.05). No significant change in CRP was measured in the inferior cornea except decreased CRP at 2.5 mm (p < 0.001). CPC power ratio in the nasal and temporal paracentral regions was 2.49 and 2.23, respectively, and 2.09 for both the inferior and superior paracentral corneal regions. Our results demonstrates that OK induced significant changes in CRP along the horizontal and vertical corneal meridians. If peripheral defocus changes are inferred from corneal topography, this study suggests that the amount of myopia experienced on the peripheral retina was greater than twice the amount of central corneal power reduction achieved after OK. However, this relationship may be dependent on lens design and vary with pupil size. CPC power ratios may provide an alternative method to estimate peripheral defocus experienced after OK.
format article
author Pauline Kang
Vinod Maseedupally
Paul Gifford
Helen Swarbrick
author_facet Pauline Kang
Vinod Maseedupally
Paul Gifford
Helen Swarbrick
author_sort Pauline Kang
title Predicting corneal refractive power changes after orthokeratology
title_short Predicting corneal refractive power changes after orthokeratology
title_full Predicting corneal refractive power changes after orthokeratology
title_fullStr Predicting corneal refractive power changes after orthokeratology
title_full_unstemmed Predicting corneal refractive power changes after orthokeratology
title_sort predicting corneal refractive power changes after orthokeratology
publisher Nature Portfolio
publishDate 2021
url https://doaj.org/article/0dfdd0f1767e4663acd7534c17da4d4f
work_keys_str_mv AT paulinekang predictingcornealrefractivepowerchangesafterorthokeratology
AT vinodmaseedupally predictingcornealrefractivepowerchangesafterorthokeratology
AT paulgifford predictingcornealrefractivepowerchangesafterorthokeratology
AT helenswarbrick predictingcornealrefractivepowerchangesafterorthokeratology
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