Publications (2)2.75 Total impact
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Article: Change in retinal image contrast with age in eyes with transparent lenses.
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ABSTRACT: To compare and evaluate changes in the retinal image with age in Japanese adults with transparent crystalline lenses. Shibuya-ku, Tokyo, Japan. Cross-sectional study. The study comprised right eyes with corrected distance visual acuity better than 0.0 logMAR. A point-spread function analyzer (PSF-1000) was used to measure retinal image contrast with 3.0 mm pupils under maximum mydriasis. A wavefront analyzer (KR9000PW) was used to measure higher-order aberrations (HOAs) with 4.0 mm pupils. The lens transparency property was estimated by the backward light-scattering intensity of each layer of the lens and the optical distance (mm) photographed by an anterior segment analysis system (EAS-1000). The Pearson product-moment correlation (R(2)) was used for statistical analysis; the significance level was 5%. The study comprised 269 patients (mean age 39.7 years ± 7.7 [SD]). The retinal image contrast degenerated significantly with age; the largest difference was seen with the 0.423 logMAR optotype, for which the decrease was 5.4% every decade. Backward light-scattering intensity (R(2) = 0.030, P<.01) and HOAs (R(2) = 0.032, P<.01) correlated negatively with retinal image contrast. Retinal image contrast in eyes with transparent lenses degenerated with age. The decrease was most prominent at the middle frequency domain and was due to the increase in HOAs and light-scattering intensity. No author has a financial or proprietary interest in any material or method mentioned.Journal of cataract and refractive surgery 08/2012; 38(10):1783-7. · 2.75 Impact Factor -
Article: UV-B exposure to the eye depending on solar altitude.
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ABSTRACT: To assess the validity of the solar ultraviolet index (UVI) as a determiner of eye risk under different conditions of facial profiles and orientation, and reflected light. Ocular UV radiation (UVR) exposure was measured as a function of the time of the day (solar altitude) using a two-dummy-type mannequin dosimetry system with embedded UVR (260-310 nm) sensors, in September and November in Kanazawa, Japan, on a motorized sun-tracking mount with one dummy face directed toward the sun and the other away from the sun. A bimodal distribution of UV-B exposure was found in September for the face directed toward the sun, which differed dramatically from the pattern of ambient UVR exposure and measurements taken on the top of the head and those for the eye taken later in the year. Although the overall level was lower, a higher solar altitude is associated with higher UVR exposure in the condition facing away from the sun. The UVI is based on ambient solar radiation on an unobstructed horizontal plane similar to our measures taken on the top of the head, which differed so much from our measures of ocular exposure that UVI as a determiner of eye risk is deemed invalid. The use of the UVI as an indicator for the need for eye protection can be seriously misleading. Doctors should caution patients with regard to this problem, and eye protection may be warranted throughout the year.Eye & contact lens 07/2011; 37(4):191-5.
