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Hirokazu Sakaguchi, Jiro Hidaka, Yusuke Oshima, Naoyuki Maeda, Kohji Nishida; Quantitative assessment of Differences in Macular Visibility through a Variety of Intraocular Lenses during Vitrectomy: an Eye Model Experimental Study. Invest. Ophthalmol. Vis. Sci. 2013;54(15):5781.
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Magnification of the macular area is sometimes required during vitrectomy. Using a model eye, we determined if the observable range of the macular area changes with the intraocular lens (IOL) type or dioptric power and determined the degree of the change.
A 10-, 15-, 20-, 25-, or 30-diopter (D) spherical IOL (VA-60BBR) or aspheric IOL (NY-60, HOYA Corporation) was inserted into a model eye. Two chandelier light pipes were inserted and a meniscus contact lens was placed on the cornea of the model eye to view the magnified macular area. A stripe chart (line width, 0.1 mm; space, 0.1 mm) placed on the macular area was photographed with a digital camera through a surgical microscope. The diameter of the clearly observable range was measured and the relationship between the diameter versus the IOL type and dioptric power were analyzed by two-way analysis of variance.
The diameter of the observable range changed from 4.4 to 2.6 mm and from 3.8 to 2.2 mm, while the dioptric powers of the spherical and aspheric IOLs changed from 10 to 30 D, respectively. The range was significantly less when the IOL dioptric power was greater and after insertion of the aspheric IOL (each p<0.0001). The ratio of the range between the IOL types was 1:0.82-0.94, while the maximal ratio of the range for the difference in the lens dioptric power was 1:0.58.
The observable macular range changed with the IOL type and dioptric power. It is important to recognize these characteristics when using magnification for surgical procedures in the macular area.
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