Figure 1: In this figure we can see some lateral shear interferograms (left and central columns) and the associated Shack-Hartmann spot patterns. The wavelength used was 632.8 nm and no pupil dilation or accommodation paralisation drugs were applied. All pictures correspond to an off-axis entrance pupil of diameter 1mm to reduce double pass effects. We can see that speckle seems to have a stronger influence on the interferograms than in the Shack-Hartmann patterns. Actually, the interferograms were produced using wedges that should introduce around 50-80 vertical fringes across the pupil, but none can be observed, not even for the longer exposures.

Figure 2: In this figure we can see some lateral shear interferograms (left and central columns) and the associated Shack-Hartmann spot patterns, this time with an illumination source emitting at 780nm. Again, no pupil dilation or accommodation paralisation drugs were applied, and all pictures correspond to an off-axis entrance pupil of diameter 1.2mm to reduce double pass effects. We can see again that speckle seems to have a stronger influence on the interferograms than in the Shack-Hartmann patterns, although in this case, for the smaller shear interferograms we can see the vertical fringes produced by the tilt introduced by the wedges.