  We show that with spatially incoherent illumination, the point spread
function width of an imaging interferometer like that used in full-field
optical coherence tomography (FFOCT) is almost insensitive to aberrations that
mostly induce a reduction of the signal level without broadening. This is
demonstrated by comparison with traditional scanning OCT and wide-field OCT
with spatially coherent illuminations. Theoretical analysis, numerical
calculation as well as experimental results are provided to show this specific
merit of incoherent illumination in full-field OCT. To the best of our
knowledge, this is the first time that such result has been demonstrated.
