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Imperfect optics may be the eye’s defence against chromatic blur

AutorMcLellan, James S.; Marcos, Susana ; Prieto, Pedro M.; Burns, Stephen A.
Palabras claveHuman eye
Optical modelling
Optical aberrations
Cone photoreceptors
Macular pigment
Retinal image
Fecha de publicación9-may-2002
EditorNature Publishing Group
CitaciónNature 417: 174-176 (2002)
ResumenThe optics of the eye cause different wavelengths of light to be differentially focused at the retina. This phenomenon is due to longitudinal chromatic aberration, a wavelength-dependent change in refractive power. Retinal image quality may consequently vary for the different classes of cone photoreceptors, cells tuned to absorb bands of different wavelengths. For instance, it has been assumed that when the eye is focused for mid-spectral wavelengths near the peak sensitivities of long- (L) and middle- (M) wavelength-sensitive cones, short-wavelength (bluish) light is so blurred that it cannot contribute to and may even impair spatial vision. These optical effects have been proposed to explain the function of the macular pigment, which selectively absorbs short-wavelength light, and the sparsity of short-wavelength-sensitive (S) cones. However, such explanations have ignored the effect of monochromatic wave aberrations present in real eyes. Here we show that, when these effects are taken into account, short wavelengths are not as blurred as previously thought, that the potential image quality for S cones is comparable to that for L and M cones, and that macular pigment has no significant function in improving the retinal image.
Descripción3 pages, 4 figures.-- PMID: 12000960 [PubMed].-- Supplementary Information accompanies the paper on Nature’s website.
Versión del editorhttp://dx.doi.org/10.1038/417174a
ISSN0028-0836 (Print)
1476-4687 (Online)
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