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; a correction data selecting unit configured to select the first correction data and the second correction data, or third correction data and fourth correction data, the third correction data being for use in correcting non-uniformity in the image being displayed by the light emitted without being passed through the left-eye optical filter, the fourth correction data being for use in correcting non-uniformity in the image being displayed by the light emitted without being passed through the right-eve 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.