Protecting your eyes from permanent damage should be a top priority for those viewing an eclipse of the sun.
Dr. Jessica Tegen and Dr. Audrey Brumley, at Madras Vision Source, recommend only using certified eclipse viewing glasses when directly viewing the partial or annular phases of the solar eclipse.
The glasses should meet requirements for ISO 12312-2:2015, which should be listed in print on the glasses.
People may only view the eclipse without eclipse glasses during totality. Never look at the sun directly at any time.
"When viewing the eclipse, first put the eclipse glasses on, then find the sun -- not the other way around! When you take the glasses off, look away from the sun first," Tegen advised.
Another safe way to view the eclipse is indirectly using a pinhole camera. You can find simple instructions on how to make a pinhole camera online. Do not confuse this with a camera used for photography.
"Directly looking at the sun for any period of time can result in solar retinopathy which may cause permanent vision loss or even blindness. There is no cure or treatment for solar retinopathy," Tegen warned.
Do not under any circumstances view the eclipse with sunglasses, no matter how dark they are. Do not view the eclipse with a telescope, binoculars or camera (which magnify the sun's intensity). Do not view the eclipse with a welder's mask or glasses. Do not view the eclipse with any broken glass or optical material.
Good eclipse glasses can be purchased at many locations in town including Madras Vision Source. Their eclipse glasses are $3 and 100 percent of the proceeds are being donated to Optometry Giving Sight which is a charitable organization that provides eye care to children in third world countries. Eclipse glasses should fit over prescription glasses easily.