Understanding the Point Spread Function and Strehl Ratio of a lens system

The image of an object produced on the retina by the Intra Ocular Lens (IOL) will not be as perfect as the object in itself. There will be some degradation of image due to diffraction effect of pupil (spreading of light when light passes through a circular aperture). Smaller the aperture, that is smaller the pupil size, larger is the diffraction. The amount of surface roughness of the IOL, or the inhomogeneities within the IOL matrix, will lead to scattering of light, which will further degrade the image quality. Aberrations present in the IOL, like spherical aberration, will also impact image quality.

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