I am shortsighted by almost 3 diopters and find a dramatic improvement at night when I wear my glasses. I'm not sure how it could be otherwise, as the depth of field decreases for larger apertures (pupil diameter). Robert H. McNaught rmn@aaocbn.aaodot gov.au To UNSUBSCRIBE from the 'meteorobs' email list, use the Web form at: http://www.tiacdot net/users/lewkaren/meteorobs/subscribe.html