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Guillermo Perez, Silvestre Manzanera, Pablo Artal; Combined effect of scattering and spherical aberration on contrast sensitivity. Journal of Vision 2007;7(15):95. doi: https://doi.org/10.1167/7.15.95.
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In the presence of scattering, some combinations of defocus and spherical aberration (SA) may improve the contrast in the image. Since during the normal aging, both spherical aberration and scattering increases in the human eye, we speculated that this could be a compensatory effect in the ocular optics. We further study this problem evaluating the impact of different combinations scattering and SA on contrast sensitivity (CS). We used an Adaptive Optics Visual Simulator (AOVS) to simultaneously manipulate the effective ocular wavefront aberration (in particular inducing the desired values of SA) and to measure the resulting visual performance. Two conditions of increased scattering were induced with holographic diffusers placed on a conjugated plane with the pupil of the subject's eye. Measurements of CS at 6 c/deg were performed for different combinations of induced scattering and SA. In some cases, CS increased slightly in the presence of scattering when SA was added. Although the relative increases in CS were not higher than a 10%, it could be understood as a possible compensatory mechanism to slightly alleviate the degrading effect of an increasing scatter with age.
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