Doctors say glaucoma is the leading cause of irreversible blindness. They add the disease has no symptoms or warning signs and no cure, but it can be treated.
Madison County was chosen as the sight for free glaucoma screenings by the Friends of the Congressional Glaucoma Caucus and Congressman Ander Crenshaw.
Chris Calabucci, district representative, says, "We knew there were folks here that would be well-served by the opportunity to be able to have their vision screened here free of charge."
Foundation consultants say Madison has an at-risk population, including senior citizens and African-Americans.
Dr. Vincen Fan says, "It's very important to, you know, screen those individuals who have the least access to health care."
Those getting screened were grateful for the free service.
Christine Blanton said, "I think it's important to keep your eyesight as long as you live, and if it's convenient like it is at the hospital, take the advantage of it."
Gary Mack added, "I have diabetes so I think it's a good thing to be checked periodically for that."
Doctors say that a glaucoma screening can detect other diseases such as diabetes, high blood pressure and cataracts.
The Friends of the Congressional Glaucoma Caucus Foundation provide free glaucoma screenings all over the country.