1. An image display apparatus comprising: an image forming unit configured to form an image for a left eye and an image for a right eye; a projecting unit configured to emit light for the left-eye image via an optical filter for the left eye and emit light for the right-eye image via an optical filter for the right eye to display the images so as to be superimposed on each other, the left-eye optical filter and the right-eye optical filter having properties different from each other; a first correcting unit configured to correct image signals for the left eye using first correction data for use in correcting non-uniformity in the image being displayed by the light emitted via the left-eye optical filter; a second correcting unit configured to correct image signals for the right eye using second correction data for use in correcting non-uniformity in the image being displayed by the light emitted via the right-eye optical filter; and a driving unit configured to drive the image forming unit on the basis of the corrected left-eye image signals and the corrected right-eye image signals to cause the image forming unit to form the left-eye image and the right-eye image.