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Haruhiko Yamada; Comparison of fundus-viewing quality using wide-field observation system through various intraocular lenses. Invest. Ophthalmol. Vis. Sci. 2013;54(15):3329.
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© ARVO (1962-2015); The Authors (2016-present)
Many kinds of intraocular lenses (IOLs) are available, but the quality of vision during vitrectomy with IOL implantation has not been well documented. In this study, we aimed to clarify differences of fundus-viewing quality using a wide-field observation system by quantitating fundus images taken through various IOLs.
We used an artificial model eye (Eyetech Co, USA) with a 100 dot/cm2 grid pattern at the fundus. An IOL was properly engaged and was exchangeable. A Leica 841 surgical microscope with a wide field attachment (Leica Microsystems GMBH, Germany) and a CCD camera were used to capture fundus images through the IOLs. The IOLs tested were: X-70, X-60 (Santen), AR40e, ZA9003 (Abott), SA60AT, SN60WF (Alcon), VA60BBR, VA65BB, PY60R, PY60AD, and VA70AD (HOYA). The ZA9003, SN60WF, PY60AD, and VA70AD lenses were aspherical (Asph) and all other IOLs were spherical (Sph). X-70 and VA70AD had a 7.0 mm optic diameter (OD), VA65BB had a 6.5 mm OD and the others had a 6.0 mm OD. All images were processed using Photoshop 4.0 software (Adobe Co, USA). The images were evaluated as follows: 1) the number of dots visible through the lens, 2) the area of the dots visible through the lens, and 3) the average area of the dots visible through the lens. ANOVA was used for statistical analysis.
1) X-70 and X-60 had the highest number of dots. 2) The visible dot area was largest in X70 (p=0.0002-0.026). 3) The average area of the dots was bigger in X-70 and VA65 IOLs, but this did not reach statistical significance. There were no statistical differences between Asph IOLs and Sph IOLs, or between IOLs with larger optics and smaller optics except the average area of the dots was greater in larger IOLs.
Compared to a similar study we previously performed in which we analyzed the observation quality through various IOLs using a direct observation system, the differences of the quality parameters between IOLs in a wide-field viewing system are thought to be very small. We hypothesized that the difference of the viewing quality between the direct and wide-field systems may be due to the direction of the reflecting light, which is crossed through the IOL in the wide-field system.
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