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KMID : 1011420100150020151
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Journal of Korean Ophthalmic Optics Society
2010 Volume.15 No. 2 p.151 ~ p.154
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An Analysis of Optical Performance of the Finite Schematic Eye Accordingto Iris Eccentricity and Visual Axis change
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Kim Bong-Hwan
Han Sun-Hee
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Abstract
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Purpose: We investigated how the movement of iris and visual axis affects the finite schematic eye
Methods: Using the schematic eye with the crystalline lens in the existing forms of the radial GRIN and the spherical GRIN, the iris centre was moved 0.5 mm in nasal direction and visual axis was tilted 5o in same direction, with the additional degree of 2.5 down to locate the focal point in fovea. This study analyzed performance change of the optical system, designing it same as the real eye.
Results: The whole aberration distribution showed a considerable difference in performance in comparison with the real eye; the biggest difference shown at the central field of optical system. The spherical aberration showed the biggest difference, and a peripheral power error and field curvature leaned toward (+) direction in aberration distribution.
Conclusions: When designing the schematic eye with the performance similar with that of the real eye by taking into consideration the iris centre and visual axis, the aberration at the center field of optical system in particular should be corrected. Spherical aberration which showed the biggest difference should be corrected in the first place. In addition, a peripheral power error and field curvature that leaned toward (+) direction should be moved toward (-) direction.
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KEYWORD
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Visual axis, Iris, Eccentricity, Finite schematic eye, GRIN
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