1 Aier School of Ophthalmology, Central South University, Changsha 410000, China 2 Aier Institute of Optometry and Vision Science, Changsha 410000, China 3 Aier School of Optometry, Hubei University of Science and Technology, Xianning 437000, China
Abstract： Objective: To evaluate the validity of the presbyopic prescription based on Clouclip (Glasson Technology Co., Ltd, Hangzhou, China). Methods: A total of 181 subjects aged 28-60 years old with normal BCVA were included in the cross-sectional study. Refractive errors were corrected using frame glasses. Clouclip was used to monitor the habitual reading distance of subjects and the near addition (ADD) was calculated with habitual reading distance. The ADD was tested by both the traditional method and Clouclip. The habitual reading distance was tested first, then the ADD of Clouclip was calculated based on habitual reading distance. Subjects were divided into a pre-presbyopia group (<40 years old) and a presbyopia group (≥40 years old) according to age. Subjects also were divided into a myopia group (<-0.50 D) and emmetropia group (-0.50- +0.50 D) based on refractive error. A factorial design ANOVA was used to analyze the influence of age and refractive error on habitual reading distance. A paired t-test, association analysis and Bland-Altman analysis were used to evaluate the consistency of traditional ADD and the ADD of Clouclip. Results: In all subjects, the presbyopic group had a farther reading distance than the pre-presbyopic group (0.37±0.06 m vs. 0.38±0.06 m, F=5.51, P=0.02), and the habitual reading distance was not affected by refractive status (F=1.48, P=0.23). The ADD of Clouclip was highly correlated with the traditional ADD (r=0.74, P<0.001). The Bland-Altman analysis showed that the average deviation was only -0.08 D. Conclusions: The habitual reading distance is affected by presbyopic status. The ADD of Clouclip is highly consistent with the traditional ADD. The method of using Clouclip to calculate ADD is an objective, accurate and personalized method for presbyopic prescriptions.
Holden BA, Fricke TR, Ho SM, et al. Global vision impairment due to uncorrected presbyopia. Arch Ophthalmol, 2008, 126(12): 1731-1739. DOI: 10.1086/379289.
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