Due to its area of deposition in the retina, and the optical properties it imparts, the level of macular pigment in the eye may have an impact on several components of vision performance.
Chromatic aberration occurs when different wavelengths of light are refracted by different amounts when passing through an optical system. The shorter wavelength blue light is refracted more than longer wavelength light at the red end of the visible spectrum, creating different focal points for each wavelength within the eye. As macular pigment strongly absorbs blue light, an increased level of macular pigment will filter and absorb more of the blue light, reducing the effects of chromatic aberration.
Contrast Sensitivity, Glare Disability & Photostress Recovery
Increased levels of macular pigment have been correlated to increased chromatic contrast sensitivity (the ability to resolve fine detail), reduced photostress recovery time (the time taken to regain vision following exposure to bright light), and reduced glare disability (the ability to discern detail under bright light conditions).