Ophthalmology in China ›› 2021, Vol. 30 ›› Issue (2): 118-123.doi: 10.13281/j.cnki.issn.1004-4469.2021.02.008

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Consistency analysis of the results of fitting orthokeratology lens based on sagittal height simulation software and standard trial lens

Zhen Yi1,2, Shen Jing1,2, Wang Wenhua1,3, Gao Jie1,3, Li Qian1,3, Wang Ningli1,2   

  1. 1National Engineering Research Center for Ophthalmology, Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Key Laboratory of Ophthalmology and Visual Science, Beijing Tongren Hospital, Capital Medical University, Beijing 100005, China; 2Beijing Advanced Innovation Center for Big Data-Based Precision Medicine, Beihang University & Capital Medical University, Beijing 100005, China; 3Beijing Tianming Ophthalmology New Technology Development Company, Beijing 100005, China

  • Received:2020-07-08 Online:2021-03-25 Published:2021-03-26
  • Contact: Wang Ningli, Email: wningli@vip.163.com
  • Supported by:
    Beijing Advanced Innovation Center for Big Data-Based Precision Medicine Project

Abstract:  Objective To compare the consistency of the results of fitting orthokeratology lens based on sagittal height simulation software and standard trial lens. Design Diagnostic tests. Participants 60 subjects (117 eyes, age 9.9±2.2 years) with myopic who needed orthokeratology fitting in Beijing Tongren Hospital. Methods Standard trial lenses were used for orthokeratology fitting in all subjects. The optometrist first experientially selected the first trial lens based on the patient's topographic map data, and then determined the parameters of lens to be produced according to the slit lamp fluorescent staining and the change of the topographic map after the try-on. The AC values of the first trial lens and the lens to be produced were recorded separately. The TR-SAG Sagittal height simulation software was developed by Beijing Institute of Ophthalmology. The software automatically calculates the corneal sagittal height based on the input patient corneal flat K value, e value, and corneal diameter, and further searches for the lens closest to the corneal sagittal height in the lens database. The AC value of the lens was taken as the output of the simulation software. One-way analysis of variance and Bland-Altman scatter plot was used to evaluate the difference between the two methods, and the intra-group correlation coefficient was used to evaluate the consistency of the results of the two methods. Main Outcome Measures AC value of the lens. Results The AC value of the first trial lens determined by the optometrist was 42.15±1.30 D. The AC value of the lens to be produced determined after the try-on was 42.10±1.28 D. And the AC value of the lens calculated by simulation software was 42.12±1.28 D. There was no significant difference among the three groups (F=0.050, P=0.951). The correlation coefficient between the AC value of the lens calculated by simulation software and the AC value of the first trial lens was 0.970 (P=0.000), and the correlation coefficient with the AC value of the lens needs to be produced was 0.968 (P=0.000), which were in good consistency. Conclusions The parameters of the orthokeratology lens calculated by the TR-SAG software are in good agreement with the parameters obtained by the optometrist using the standard trial lens. (Ophthalmol CHN, 2021, 30: 118-123)


Key words:  orthokeratology lens, sagittal, simulation, consistency test