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Eiichi Okada, Nobuhisa Mizuki, Tatsukata Kawagoe, Mai Nagasaki, Naomi Matsunaga, Masao Yoshida; The Large-Scale Epidemiological Study on the Prescription of Contact Lenses in Japan -The Result from Analyzing approximately 330,000 Eyes of Japanese Subjects-. Invest. Ophthalmol. Vis. Sci. 2013;54(15):5477.
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In Japan there is an abundance of research regarding the number of people using contact lenses and types of lenses consumed, however, there are only a few analysis studies of Japanese subjects regarding sex, age and refractive levels of diopter (D) based on the number of eyes which contact lenses are prescribed. Therefore we made a five-year large-scale epidemiological study.
The subjects for this research were 204,975 eyes from 103,001 men and women aged 9-96 who visited Okada Eye Clinic in Yokohama, Japan, for the prescription of contact lenses between January 2007 and December 2011, excluding eyes with orthokeratology, cataract operated eyes and cases of changes exceeding ±5D in a year. The total number of the prescriptions amounted to 332,469 eyes.
Analyzing the number of eyes which contact lenses were prescribed by sex and age, the groups aged 20-24 showed the highest ratio (19.22% in men and 17.58% in women), followed by the groups aged 25-29 (17.53% in men and 15.60% in women) and the groups aged 15-19 (16.46% in men and 15.29% in women). Viewing it by sex and refractive levels, the groups with refractive level of -2.75 to -4.5D showed the highest ratio (40.76% in men and 40.97% in women), followed by the groups of -4.75 to -6.5D (25.87% in men and 24.51% in women) and the groups of -0.75 to -2.5D (20.89% in men and 23.19% in women). In addition, the ratio of hyperopia ≥+0.75D was less than 1% (0.27% in men and 0.84% in women), however, the ratio of myopia ≤-6.75D was about 10% (11.71% in men and 9.79% in women), and the ratio ≤-8.75D was about 2.5% (2.85% in men and 2.24% in women).
The results of this survey revealed that the number of eyes prescribed to contact lenses was the highest in the groups aged 15-29 (approximately 50%) and -2.75 to -4.5D was most prescribed (approximately 40%) in both men and women. Although the number of the eyes in hyperopia ≥+0.75D in women was more than in men, it was only less than 1%. However, the number of the eyes in high myopia ≤-6.75D in men was more than in women and it showed about 10% in both men and women.
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