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Kota Nagai, Yasuo Sakamoto, Natsuko Hatsusaka, Tetudai Mita, Masami Kojima, Yutaka Kawakami, Kazuyuki Sasaki, Hiroshi Sasaki, Fridbert Jonasson; Evaluation of Crystalline Lens Waterclefts by Image Analysis. Reykjavik Eye Study. Invest. Ophthalmol. Vis. Sci. 2011;52(14):2796.
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© ARVO (1962-2015); The Authors (2016-present)
Waterclefts (WC) are fiber-based opacities usually located at the y-sutures in the superficial cortical zone. Eyes with WC show higher coma and trefoil aberrations causing reduced visual function, but the effect is difficult to evaluate precisely. We investigated use of image processing in evaluation of WC.
Among the 573 participants aged 50 years or older of the Reykjavik Eye Study (RES) in 2008, 29 right eyes (13 male; 16 female; mean±SD age 71.8±4.3 years) with WC were compared with 194 transparent right eyes (97 male; 97 female; mean±SD age 66.8±4.5 years) from retroillumination images by anterior eye segment analysis system (EAS-1000, NIDEK). Optical function was evaluated by wavefront analyzer (KR9000PW, Topcon) for higher order aberrations (HOA) and point spread function analyzer (PSF-1000, Topcon) for retinal image contrast. Retroillumination images were analyzed by Fast Fourier Transform and standardization of level. WC was quantified by optical irregularity in the 4 mm diameter pupillary area. Correlations between optical irregularity and HOA, and retinal image contrast were investigated.
WC as optical irregularity within the optical zone of 4.0mm ranged through 1.65~4.19. There was no significant correlation between optical irregularity and three types of internal ocular total HOA (coma, trefoil, spherical) for optical zones of 4.0mm and 6.0mm. There was a significant correlation between optical irregularity and retinal image contrast of 0.7,0.8logMAR index with optical zones of 3.0mm
There was significant correlation between WC as an optical irregularity and retinal image contrast, and, so this image analyses method could be useful to evaluate WC.
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