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Eiichi Okada, Nobuhisa Mizuki, Akira Meguro, Takuto Sakono, Masao Yoshida; A thirteen year, large scale, follow-up study on the number of prescriptions of hard contact lenses in Japan. - The result of age group analysis of approximately 178,000 Japanese subjects eyes-. Invest. Ophthalmol. Vis. Sci. 2016;57(12):1469.
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© ARVO (1962-2015); The Authors (2016-present)
There have been few detailed large scale studies which have analyzed the prescription of hard contact lenses (HCL) to Japanese subjects by age. Therefore, a 13 year large scale follow-up study was undertaken to analyze approximately 178,000 eyes of Japanese subjects by age group.
The subjects of this study are the 177,894 eyes of Japanese subjects in the age range 6 to 100, prescribed HCL to correct ametropia (single vision: 170,058 eyes, age 10 to 100; bifocal vision: 5,124 eyes, age 38 to 81; orthokeratology: 2,712 eyes age 6-65). The prescriptions were made at the Okada eye clinic in Kanagawa, Japan from April, 2002 to December, 2014.
The 30-39 year age group was prescribed HCL most frequently (53,897 eyes [30.3%]). This was followed by the 40-49 year group (46,325 eyes [26.0%]) and the 20-29 year group (32,934 eyes [18.5%]). Next are the results were analyzed by age group and HCL type. The 30-39 year age group were prescribed the most single focus HCL (53,492 eyes [31.5%]), followed by the 40-49 year group (44,276 eyes [26.0%]); 20-29 years old (32,334 eyes [19.0%]). On the other hand, the users of bifocal HCL increased substantially from a low rate in the under 40s (12 eyes [0.2%]); to a high rate in those between 40 and 60 years old: 40-49 years old (1,843 eyes [36.0%]) and 50-59 years old (2,723 eyes [53.1%]). However, post 60 years old the rate began to fall sharply again (546 eyes [10.6%]). In addition, half of the wearers of the orthokeratology lenses were between 10-19 years old (1,355 eyes [50.0%]). This was followed by those 20-29 years old (600 eyes [22.1%]); 30-39 years old (393 eyes [14.5%]). The number of wearers significantly decreased as age increased (P for trend <0.0001).
Analyzing the number of prescriptions of HCL and SCL by age group, it is suggested that the age distribution of prescriptions of HCL was approximately 10 years older. 94.5% of SCL wearers were aged between 10-49 years old (the majority being 20-29 years old [35.4%]). However, 91.7% of the HCL users were between 20-59 years old (the majority being 30-39 years old [30.5%]). In addition, in the 10-19 year age group, the prescription of HCL was only 3.5%, whereas the prescription of SCL was 22.6%. Thus, the number of prescriptions of HCL was extremely low compared to SCL.
This is an abstract that was submitted for the 2016 ARVO Annual Meeting, held in Seattle, Wash., May 1-5, 2016.
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