On Aug. 21, the entire viewing area will be plunged into darkness.
Staring directly into the sun is can damage your eyes, and would-be eclipse viewers could be purchases and using products that won't properly protect them.
But other stores, like Madison-area Walmarts, were still selling the glasses for $1; a pair of glasses with an informational eclipse booklet was going for about $3.50. The eclipse will be visible here from about noon to 3 p.m.
"People need to remember that ordinary sunglasses, even very dark ones, are not safe for looking at the sun", adds Dr. Kenneth Knudtson.
Read and follow all directions that come with your glasses or filters.
After looking at the sun, turn away to remove your filters or glasses.
At 7:30 p.m. Tuesday, the Fort Wayne Astronomical Society will offer more information about solar eclipses and show people how to make a pinhole eclipse viewer during the nonprofit group's general meeting at the main branch of the Allen County Public Library, 900 Library Plaza.
In addition to its preparation event, the Fort Wayne Astronomical Society also will help people experience the solar eclipse by having members out from noon to 3 p.m. August 21 in the plaza outside the main library, a group news release said. Those optical devices concentrate the solar rays, damaging your eclipse glasses or viewer and seriously injuring your eyes.
In Madison on Friday, the glasses were sold out at Kirkland's on the Far East Side and at Toys R Us on the Far West Side.
When purchasing eclipse glasses be certain ISO 12312-2 (or EN1836) is printed somewhere on them.
A limited supply of free eclipse glasses are also available from the Brookings Public Library (limit two per family). This certification is used to indicate they are safe for viewing the sun.