Abstract

Volume.116 Number.4

Original article : Clinical science

Comparison of Central Visual Field Visualization while Using a Combination of Spherical Intraocular Lenses with Vitreous Contact Lenses
Tatsushi Kaga1, Hiroshi Uozato2, Takushi Kawamorita2, Norihiko Yoshida1
1 Department of Ophthalmology, Social Insurance Chukyo Hospital
2 Kitasato University School of Allied Health Sciences, Orthoptics and Visual Science

Objective: To investigate intraocular lens (IOL) and vitreous contact lens (VCL) combinations that provide good central visual field visualization in vitreous surgery.
Method: ZEMAXTM optical design software was used to perform optical simulations using the ray tracing method on a Gullstrand eye model. The implanted IOL was assumed to consist of material with a refractive index of 1.550 (high refractive index acrylic IOL), 1.470 (low refractive index acrylic IOL) and 1.413 (silicon IOL), and was set as a biconvex spherical lens (optical diameter 6 mm, 23.5 D). The VCL was assumed to have a refractive index of 1.900 (HEMA VCL), 1.490 (PMMA VCL) and 1.413 (silicon VCL), and was set as a concave lens (optical diameter 10 mm) with a flat anterior surface and a posterior surface with a radius of curvature of 7.70 mm. The spherical aberration of the overall optical system, including the IOL-implanted eyeball and the VCL, was calculated.
Results: Spherical aberration was lowest with the silicon VCL for the high refractive index acrylic IOL and with the PMMA VCL for the low refractive index acrylic and silicon IOLs.
Conclusion: The combinations providing the best central visual field visualization in vitreous surgery are a silicon VCL for implantation of a high refractive index acrylic IOL and a PMMA VCL for implantation of a low refractive index acrylic or silicon IOL.
Nippon Ganka Gakkai Zasshi (J Jpn Ophthalmol Soc) 116: 383-386, 2012.

Key words
Vitreous contact lens, Intraocular lens, Fundus visualization, Spherical aberration, Refractive index
Reprint requests to
Tatsushi Kaga, M.D. Department of Ophthalmology, Social Insurance Chukyo Hospital. 1-1-10 Sanjo, Minami-ku, Nagoya 457-8510, Japan