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

摘要: The optics of the eye cause different wavelengths light to be differentially focused at retina. This phenomenon is due longitudinal chromatic aberration, a wavelength-dependent change in refractive power1. Retinal image quality may consequently vary for classes cone photoreceptors, cells tuned absorb bands wavelengths. For instance, it has been assumed that when mid-spectral near peak sensitivities long- (L) and middle- (M) wavelength-sensitive cones, short-wavelength (bluish) so blurred cannot contribute even impair spatial vision2,3. These optical effects have proposed explain function macular pigment4, which selectively absorbs light, sparsity short-wavelength-sensitive (S) cones5. However, such explanations ignored effect monochromatic wave aberrations present real eyes. Here we show that, these are taken into account, short not as previously thought, potential S cones comparable L M pigment no significant improving retinal image.