September 2016
Volume 57, Issue 12
Open Access
ARVO Annual Meeting Abstract  |   September 2016
Relationship between near phoria, fusional amplitudes and personalized addition values for myopia control
Author Affiliations & Notes
  • Jinhua Bao
    School of Ophthalmology and Optometry, Wenzhou Medical University (WMU), Wenzhou, China
    WEIRC, WMU-Essilor International Research Center, Wenzhou, China
  • Xinping Yu
    School of Ophthalmology and Optometry, Wenzhou Medical University (WMU), Wenzhou, China
    WEIRC, WMU-Essilor International Research Center, Wenzhou, China
  • Björn Drobe
    R&D Optics Asia, Essilor International, Wenzhou, China
    WEIRC, WMU-Essilor International Research Center, Wenzhou, China
  • Binjun Zhang
    School of Ophthalmology and Optometry, Wenzhou Medical University (WMU), Wenzhou, China
    WEIRC, WMU-Essilor International Research Center, Wenzhou, China
  • Junxiao Zhang
    School of Ophthalmology and Optometry, Wenzhou Medical University (WMU), Wenzhou, China
    WEIRC, WMU-Essilor International Research Center, Wenzhou, China
  • Hao Chen
    School of Ophthalmology and Optometry, Wenzhou Medical University (WMU), Wenzhou, China
    WEIRC, WMU-Essilor International Research Center, Wenzhou, China
  • Footnotes
    Commercial Relationships   Jinhua Bao, Essilor International (F); Xinping Yu, Essilor International (F); Björn Drobe, Essilor International (E); Binjun Zhang, Essilor International (F); Junxiao Zhang, Essilor International (F); Hao Chen, Essilor International (F)
  • Footnotes
    Support  International S&T Cooperation Program of China (grant no. 2014DFA30940); Essilor International S.A.
Investigative Ophthalmology & Visual Science September 2016, Vol.57, 2488. doi:
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      Jinhua Bao, Xinping Yu, Björn Drobe, Binjun Zhang, Junxiao Zhang, Hao Chen; Relationship between near phoria, fusional amplitudes and personalized addition values for myopia control. Invest. Ophthalmol. Vis. Sci. 2016;57(12):2488.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : Personalized addition values for myopia control were determined based on the highest addition that satisfied Sheard’s criterion without inducing any lead of accommodation. This study examines the relationship between near phoria, fusional amplitudes and personalized addition values in a sample of myopic children.

Methods : Two hundred and eleven Chinese myopic children (7 to 12 years old) with myopia between -0.75 and -4.00D (cycloplegic autorefraction) were enrolled in PACT (Personalized Addition value Clinical Trial). Near phoria was measured at 33 cm using the modified Thorington test and either base-in (near esophoria) or base-out fusional amplitudes (FA) (near exophoria & orthophoria) were measured with a phoropter with the children wearing their far vision prescription. Three measurements of each parameter were averaged for analysis. Personalized addition value was determined for each child by a non-linear regression using a FA/Phoria = abs(a/(b × Addition + c)) rational function, where “a” represents a form factor and “–c/b” the addition value for which the phoria is null.

Results : When measured without any addition, personalized addition (pADD) values increased significantly when near esophoria increased or exophoria decreased (r2 = 0.19, P < 0.001). There was no correlation between personalized addition values and FA (r2 = 0.002, P = 0.523). A multivariate linear regression, performed to quantify the variation of pADD with near phoria and FA when measured without any addition value, explained only a limited amount of variance (r2 = 0.263, pADD = 1.411+ 0.078×Phoria + 0.027×FA).

Conclusions : Only near phoria values or fusional amplitudes measured without any addition are not enough to obtain a good estimation of personalized addition values based on Sheard’s criterion. According to our previous study (Yu et al., OVS, 2015), near addition lens values should be calculated for each addition and fitted using a rational function to satisfy Sheard’s criterion (FA/Phoria ≥ 2).

This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.

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