Due to poor air quality related to fires in California, the Academy’s San Francisco offices will be closed Friday, Nov. 16. Member support staff will not be available by phone and responses to emails may be delayed.

  • Illustration developed by Kevin M. Miller, MD, and rendered by C. H. Wooley.
    File Size: 51 KB
    Refractive Mgmt/Intervention

    A, Textbooks often illustrate images produced by lenses as stigmatic. B, In most cases, however, the images are not stigmatic. The point spread function reveals how faithfully an imaging system reproduces each object point.