TABLE 2.

A brief description of each of the top 10 retinal image quality metrics for predicting logMAR acuity

logPFSc	Log of the pupil fraction; pupil fraction is defined as the concentric area for which root mean squared error of the slopes of the wavefront error is <1 arcmin divided by total available pupil area
log Area OTF	Log of the area of visibility for the radially averaged optical transfer function (normalized to diffraction-limited case); the radially averaged optical transfer function (OTF) is determined by integrating the full two-dimensional OTF over orientation; because the phase transfer function component of the OTF is taken into account when computing rOTF, this metric is intended to capture spatial phase errors in the image
SFcOTF	Spatial frequency cutoff of radially averaged OTF
log PFSt	Log of the pupil fraction when pupil fraction is defined as the area of a subaperture that satisfies the criterion horizontal slope and vertical slope are both <1 min arc divided by total available pupil area
log VSOTF	Log of the visual Strehl ratio computed in frequency domain using the OTF method in which the OTF is weighted by the contrast sensitivity function
log SRMTF	Log of the Strehl ratio calculated using the MTF method
log STD	Log of the standard deviation of intensity values in the point spread function (PSF) normalized to standard deviation of the intensity values in the PSF for the diffraction-limited case
log VSMTF	Log of the visual Strehl ratio computed in frequency domain using the modulation transfer function (MTF) method in which the MTF is weighted by the contrast sensitivity function
log NS	Log neural sharpness is defined as the PSF weighted by spatial sensitivity function of the neural system and normalized by the diffraction-limited PSF
RMSw	Root mean squared error of the wavefront error; this is equivalent to the standard deviation of the wavefront error