0 9 mm area on retina the field of view is adjusted easily by changing the control voltages of the scanners if an object plane is at an angle to the principle axis of an optical system its related image plane is formed at an angle to the principle axis thus the optical conjugate plane of a scanner at the entrance pupil of the eye is not a fixed plane but a rotating plane as a variable of the optical scanning angle the shack hartmann wavefront sensor measures the average aberrations over the integration time of the ccd camera the combination of resonate scanner and galvanometric scanner provides raster images at 30 frame per second with 525 lines per frame although the optical relay design attempts to minimize this effect both horizontal and vertical scanners still produce some changes in beam properties at the entrance pupil of the eye however pupil shift and distortion can be minimized using designed tilt angles and spherical mirrors with longer focal lengths in the optical design optimization process it is to be noted that the beam locations and sizes are changing as a function of scan angle when using the dual dm aoslo as disclosed herein however the wavefront measurement and compensation is not significantly affected as long as the change in beam footprints due to scanning is less than half of the subaperture the maximum change allowed in the current aoslo is 300 u03bcm at the pupil plane of the eye to avoid wavefront registration errors and.