Article
Ophthalmology
Zhe Zhang, Jiaqi Zhou, Li Zeng, Feng Xue, Xingtao Zhou, Zhi Chen
Summary: In this study, the correlation between spatial corneal power distribution and one-year axial length elongation was investigated using three ortho-k lens designs. The power exponent and maximum X value in the DRL group were significantly smaller than those in the other two groups. The one-year axial length elongation was slower in the DRL group compared to the Euclid and CRT groups. Axial length elongation was significantly correlated with maximum X value, power exponent, and age.
CONTACT LENS & ANTERIOR EYE
(2023)
Article
Neurosciences
Fan Jiang, Xiaopeng Huang, Houxue Xia, Bingqi Wang, Fan Lu, Bin Zhang, Jun Jiang
Summary: The study found that the spatial distribution of the relative corneal refractive power shift plays a significant role in myopia control. Corneal reshaping induced less axial length elongation compared to multifocal soft contact lenses, indicating that contact lenses inducing RCRPS closer to the corneal center may have a better effect on myopia control.
FRONTIERS IN NEUROSCIENCE
(2021)
Article
Ophthalmology
Weiping Lin, Na Li, Jiahe Liu, Bin Zhang, Ruihua Wei
Summary: This study investigates the relationship between relative corneal refractive power shift (RCRPS) and axial length growth (ALG) in children with myopic anisometropia treated with orthokeratology. The results show that orthokeratology effectively reduces the difference in ALG between the more myopic and less myopic eyes, and the interocular difference in RCRPS is correlated with the interocular difference in ALG.
GRAEFES ARCHIVE FOR CLINICAL AND EXPERIMENTAL OPHTHALMOLOGY
(2023)
Article
Ophthalmology
Liyuan Sun, Xuewei Li, Heng Zhao, Yan Li, Kai Wang, Jia Qu, Mingwei Zhao
Summary: The purpose of this study was to investigate the relationship between patients' baseline biometric factors or lens parameters and the diameter of the treatment zone in young myopic children undergoing Corneal Refractive Therapy. Retrospective review of data from patients undergoing Corneal Refractive Therapy lens treatment within two years was conducted. Results showed that spherical refraction, flat keratometric reading, Reverse Zone Depth 2, Landing Zone Angle 1, and lens diameter were independent factors of treatment zone diameter. Logistic regression analysis accurately predicted the treatment zone size with a 71.5% accuracy.
CONTACT LENS & ANTERIOR EYE
(2023)
Article
Ophthalmology
Mark A. Bullimore, Maria Liu
Summary: This paper comprehensively reviews the published studies on the efficacy of the Euclid Emerald lens designs for orthokeratology in slowing myopia progression in children. The results demonstrate that this lens design is effective in slowing axial elongation in myopic children.
CONTACT LENS & ANTERIOR EYE
(2023)
Article
Medicine, General & Internal
Jian Qin, Huiling Qing, Na Ji, Tianbin Lyu, Hui Ma, Menghai Shi, Shiao Yu, Conghui Ma, Aicun Fu
Summary: Unilateral orthokeratology lenses effectively reduced axial elongation in the more myopic eyes and reduced interocular AL differences in children with myopic anisometropia. The refractive state of the untreated eyes did not affect the axial elongation of the more myopic eye wearing the orthokeratology lens. In the untreated eyes, AL increased faster in the low myopia subgroup than in the emmetropia subgroup.
FRONTIERS IN MEDICINE
(2023)
Article
Ophthalmology
Xiaoyan Yang, Hua Bi, Lihua Li, Shumao Li, Song Chen, Bin Zhang, Yan Wang
Summary: The study found that myopic children fitted with type-B lenses showed significantly smaller axial length growth, smaller treatment-zone decentrations, smaller X50 values, and greater Sum4 values. X50 was significantly associated with axial length growth. Therefore, the spatial distribution of RCRPS is critical in retarding axial length growth.
CURRENT EYE RESEARCH
(2021)
Article
Ophthalmology
Weiping Lin, Na Li, Kunpeng Lu, Zhaochun Li, Xiaohua Zhuo, Ruihua Wei
Summary: This study investigated the correlation between baseline axial length (AL) and axial elongation in myopes undergoing orthokeratology (ortho-k). The results showed a negative association between axial elongation and baseline AL in the ortho-k group. Furthermore, children aged 8-11 years with longer baseline AL demonstrated slower annual axial elongation during the first 2 years of ortho-k treatment.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2023)
Article
Ophthalmology
Zhi Chen, Zhe Zhang, Feng Xue, Jiaqi Zhou, Li Zeng, Xiaomei Qu, Xingtao Zhou
Summary: This study investigated the relationship between myopia progression and axial length elongation in orthokeratology patients. The results showed that myopia significantly progressed and axial length increased after ortho-k treatment, and this progression was related to changes in corneal curvature, baseline age, and duration of treatment.
CONTACT LENS & ANTERIOR EYE
(2023)
Article
Ophthalmology
Na Li, Weiping Lin, Kailang Zhang, Bingqin Li, Qiang Su, Bei Du, Ruihua Wei
Summary: This study compares axial elongation, relative corneal refractive power (RCRP) distribution within the pupillary diameter, and corneal higher-order aberrations (HOAs) in myopic children wearing orthokeratology (ortho-k) lenses with different back optic zone diameters (BOZD). The results show that ortho-k lenses with smaller BOZD have better myopia control efficacy, induce a steeper distribution of the RCRP profile within the pupillary diameter, and induce greater increases in corneal total HOAs and horizontal coma (Z13).
CONTACT LENS & ANTERIOR EYE
(2023)
Article
Ophthalmology
Ya Qi, Lizhou Liu, Yu Li, Fengju Zhang
Summary: This retrospective study analyzed the records of 73 myopia children who wore orthokeratology (OK) lens for at least one year. The study found that the change in axial length was related to age, parental myopia, and baseline myopia. It also found that wearing OK lens may lead to a decrease in axial length in some cases. The study suggests considering more aggressive treatment in myopia children with lower baseline myopic spherical equivalent, younger initial age, and higher parental myopia.
Article
Ophthalmology
Kaidi Xiang, Jun Chen, Wenchen Zhao, Zhuoting Zhu, Li Ding, Gabriella Bulloch, Linlin Du, Xun Xu, Mengjun Zhu, Xiangui He
Summary: In this study, the corneal biomechanical properties of children wearing ortho-k lenses were analyzed. It was found that these properties initially fluctuated before stabilizing over time. Furthermore, the maximum deformation amplitude at baseline was strongly correlated with axial length progression. Combining age, axial length, and maximum deformation amplitude at baseline could predict axial length progression in low myopia patients using ortho-k.
ACTA OPHTHALMOLOGICA
(2023)
Article
Multidisciplinary Sciences
Zhu Huang, Wei Zhao, Ying-zheng Mao, Shan Hu, Chi-Xin Du
Summary: This retrospective study collected axial length and corneal aberration data on 78 eyes before and after orthokeratology treatment to identify the factors influencing axial length in children with myopia. The study found that the age when wearing orthokeratology lenses, lens type, and change in the C12 of the total corneal surface were the most important factors influencing axial length.
SCIENTIFIC REPORTS
(2023)
Article
Ophthalmology
Biyue Guo, Huihuan Wu, Sin Wan Cheung, Pauline Cho
Summary: This study compared the treatment zone measurements obtained using manual and software-based methods in orthokeratology subjects. The results showed significant differences between the two methods, suggesting that they cannot be used interchangeably. The study also found significant differences in treatment zone parameters between slow and fast axial elongation subjects, indicating a potential role of the treatment zone in regulating myopia progression in ortho-k.
OPHTHALMIC AND PHYSIOLOGICAL OPTICS
(2022)
Article
Ophthalmology
Li-hua Yu, Wan-qing Jin, Xin-jie Mao, Jun Jiang
Summary: This study examined the effects of Ortho-K on myopic eyes, showing that it was equally effective in reducing myopic progression in moderate and high myopic eyes. Axial elongation was greater in males than females, and regardless of the difference in myopia, the rate of change in axial length decreased at the same rate with increasing age for both sexes.
CLINICAL AND EXPERIMENTAL OPTOMETRY
(2021)