1. A method to determine optical deviations caused by an aircraft canopy that comprises: generating a collimated beam of light to illuminate a 3-D pilot eye volume (PEV); passing the collimated beam of light through an array of subapertures, each projecting a collimated beam of light; directing the patterned collimated beams of light to produce an undistorted image on an imaging screen, wherein the undistorted image is electronically imaged and stored in memory; directing the patterned collimated beam of light through the aircraft canopy, wherein the aircraft canopy distorts the patterned collimated beam of light to produce a distorted image on an imaging screen, wherein the distorted image is electronically imaged and stored in memory; comparing the distorted image to the undistorted image to determine the optical distortions caused by the aircraft canopy.