The Congressional Glaucoma Foundation will unveil a new mobile screening unit today to provide free screenings for the eye disease. [IMGCAP(1)]

Members of Congress will dedicate the vehicle at 11 a.m. in Room 2218 of the Rayburn House Office Building. Free testing for Members and staff will be provided later in the parking lot at the corner of New Jersey Avenue and C Street Southeast.

The vehicle, supported by a grant from Pfizer Ophthalmic, will travel the Mid-Atlantic offering free testing. It will be at Davis Elementary in D.C. on Saturday and at the annual Parent Expo at the D.C. Armory on Oct. 4.

Isabel Intimidates. The U.S. Capitol Historical Society has canceled its 2003 Symposium in anticipation of Hurricane Isabel.

“Capitol Additions and Extensions — 1850 to the Present,” originally scheduled for Friday, has been tentatively rescheduled to Nov. 21, according to the society’s Web site.

Unilateralism Discussion. The House Bipartisan Task Force on Non-Proliferation will host a discussion Thursday on “The Limits of Unilateralism.”

The event, hosted by the task force’s co-chairmen, Reps. Ed Markey (D-Mass.) and Christopher Shays (R-Conn.), will feature primatologist Jane Goodall, actor Michael Douglas and retired Ambassador Thomas Graham Jr.

It begins at 2 p.m. in Room 345 of the Cannon House Office Building.

— Douglas Fruehling and Jennifer Yachnin