The Effect of Relative Corneal Refractive Power Shift Distribution on Axial Length Growth in Myopic Children Undergoing Orthokeratology Treatment

To quantify the spatial distribution of relative corneal refractive power shift (RCRPS) to investigate its association with axial length growth. Eighty myopic children were randomly assigned for fitting with type A or B lenses. Axial lengths and corneal topographies were measured at baseline and the...

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Vydáno v:Current eye research Ročník 46; číslo 5; s. 657 - 665
Hlavní autoři: Yang, Xiaoyan, Bi, Hua, Li, Lihua, Li, Shumao, Chen, Song, Zhang, Bin, Wang, Yan
Médium: Journal Article
Jazyk:angličtina
Vydáno: England Taylor & Francis 04.05.2021
Témata:
Adolescent
axial Length
Axial Length, Eye - pathology
Child
Contact Lenses
Cornea - physiopathology
Corneal Topography
Female
Follow-Up Studies
Humans
Male
Multivariate Analysis
myopia
Myopia - physiopathology
Myopia - therapy
Orthokeratologic Procedures - methods
Orthokeratology
Prospective Studies
Refraction, Ocular - physiology
relative Corneal Refractive Power Shift (RCRPS)
spatial Distribution
Visual Acuity - physiology
myopia
relative Corneal Refractive Power Shift (RCRPS)
spatial Distribution
Orthokeratology
axial Length
ISSN:0271-3683, 1460-2202, 1460-2202
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Shrnutí:To quantify the spatial distribution of relative corneal refractive power shift (RCRPS) to investigate its association with axial length growth. Eighty myopic children were randomly assigned for fitting with type A or B lenses. Axial lengths and corneal topographies were measured at baseline and the 1-, 6-, and 12-months follow-up visits. Treatment-zone decentrations and sizes were derived from tangential maps. RCRPSs were computed by taking the difference between after-treatment and baseline axial maps and then subtracting the apex value. Values at the same radius were averaged to obtain an RCRPS profile, from which four distributional parameters were extracted: the peak value (Rmax), the location where the profile first reached its half peak (X50), and the powers summed within 4- and 8-mm diameter areas (Sum4 and Sum8, respectively). Linear mixed models were used to analyse the correlation between the AL growth and the distributional parameters. At baseline, no significant differences were observed between the two groups. After treatment, Axial length growth was significantly smaller in subjects fitted with type-B lenses (0.15 ± 0.16 vs 0.25 ± 0.22 mm, P = .028). Smaller treatment-zones (1.56 ± 0.14 vs 1.75 ± 0.13 mm, P < .01), smaller X50 values (1.56 ± 0.39 vs 1.98 ± 0.28 mm, P < .01), and greater Sum4 values (11.83 ± 6.47 vs 8.14 ± 5.06 D, P = .01) were also observed in subjects wearing type-B lenses. Among the distributional parameters, only X50 was significantly associated with AL growth in the multiple regression analysis (P = .005). The spatial distribution of RCRPS is critical in retarding AL growth, and the ones reaching peak within a shorter distance from the apex may provide better myopia control.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:0271-3683
1460-2202
1460-2202
DOI:10.1080/02713683.2020.1820528