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| Reasons and Effects of the Lens Parameters Adjustment in Corneal Refractive Therapy in the Short Term |
| Yujing Li, Yuzhuo Fan, Heng Zhao, Kai Wang, Mingwei Zhao |
| Department of Ophthalmology & Clinical Centre of Optometry, Peking University People's Hospital,College of Optometry, Peking University Health Science Center, Eye diseases and Optometry Institute,Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing 100044, China Corresponding author: Kai Wang, Department of Ophthalmology & Clinical Centre of Optometry, Peking |
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Abstract Objective: To explore the causes for early adjustment of lens parameters in Paragon corneal refractive therapy (CRT) fitting, and analyze the effects of adjustment. Methods:This was a retrospective study.All participants were recruited from patients who were ftted with CRTlenses in the Optometry Center of Peking University People's Hospital from April 2018 to May 2021. The ocular parameters of 65 myopic patients (90 eyes) who met the inclusion criteria were randomly selected. In this study, the adjustment of the parameters was compared and the reason for the adjustment was analyzed. A customized Matlab program was used to calculate the change of treatment zone area (TZA), treatment zone decentration (TZD),and weighted Zernike defocus coeffcient (Cweighted defocus) after the adjustment. All subjects were divided into three groups according to the causes of adjustments: poor visual acuity group, corneal staining group, and large treatment zone group. Paired t-test was conducted in the overall and each group. Results: Among all 90 eyes included in the study, the cases of adjustment due to corneal staining accounted for 28 eyes (31%), due to large treatment zone accounted for 41 eyes (46%) , due to poor visual acuity accounted for 21 eyes (23%). The variation of sagittal height before and after adjustment of lens parameters in all cases was 6.59±30.85 μm. TZAwas 12.88±3.69 mm2 and 11.77±3.17 mm2 before and after adjustment, with a change of -1.11±3.01 mm2 (t=-3.50, P=0.001).TZD was 0.63±0.31 mm and 0.57±0.29 mm before and after adjustment, with a change of -0.07±0.28 mm (t=-2.29, P=0.024). The difference of TZAand TZD was statistically signifcant between the before and after adjustment. Cweighted defocus was 0.44±0.20 D/mm2 and 0.49±0.19 D/mm2 before and after adjustment, respectively, with a change of 0.03 ± 0.20 D/mm2. While the change of Cweighted defocusshowed no statistically signifcantdifference(t=1.16, P=0.190). Conclusions:The mainreasons for parameter adjustment of CRTlenses were large treatment zone, corneal staining and poor visual acuity. The large treatment zone accounted for the highest proportion. After adjusting the lens parameters, the decentration and the area of treatment zone were reduced.
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Received: 31 July 2022
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| Fund:National Natural Science Foundation of China (82171092, 81870684); the Capital's Funds for Health Improvement and Research (2022-1G-4083); the National Key R&D Program of China (2020YFC2008200, 2021YFC2702100) |
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Corresponding Authors:
Kai Wang, Department of Ophthalmology & Clinical Centre of Optometry, Peking University People's Hospital, College of Optometry, Peking University Health Science Center, Eye diseases and Optometry Institute, Beijing Key Laboratory of Diagnosis and Therapy of Retinal and Choroid Diseases, Beijing 100044, China (Email: wang_kai@bjmu.edu.cn)
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. [J]. Chinese Journal of Optometry Ophthalmology and Visual science, 2023, 25(8): 0-. |
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