To investigate the effect of scatter
on measurements of wavefront aberrations and point-spread functions in a model eye.
The wavefront aberrations of a model eye were measured using Hartmann-Shack wavefront sensing and crossed-cylinder aberroscope
techniques and compared with its measured point-spread function
in the presence of scattering media of different concentrations.
The point-spread functions became broader as the concentration increased. Forward light scatter
on both the light path into the eye and the light path out of the eye contributed to this broadening of the point-spread function
. Neither the crossed-cylinder aberroscope
nor wavefront sensing, which, respectively, measure the ocular wavefront aberrations for light entering the eye and leaving the eye, were affected by the scatter
We predict that by minimizing the contribution of the forward light scatter
from one or other of these light paths by manipulating the size of the entrance and exit pupils, it should be possible to objectively assess narrow-angle forward light scatter
in the eye by measuring and removing any confounding effect from wavefront aberration.