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Dispersion and longitudinal chromatic aberration (LCA) of the crystalline lens of the African cichlid fish Haplochromis burtoni were measured with laser lights of four wavelengths: 457, 488, 515, and 633 nm. LCA and spherical aberration, as an indicator of image quality, were determined from the back vertex distances of laser beams deflected by the lens. In the green range between 488 and 515 nm, dispersion is almost constant in the entire lens. In the blue and the red ranges (457–488 and 515–633 nm, respectively), dispersion of lens material increases approximately linearly with increasing refractive index from the periphery to the center of the lens. Spherical aberration and thus monochromatic image quality are independent of the wavelength of light. Dispersion and LCA of the lens are lower than expected from the dispersive properties of ocular media measured in other vertebrate species. Since the lens in fish sets the limit on optical performance, reduction of chromatic aberration of the crystalline lens improves the image quality of the eye.
© 1996 Optical Society of America
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