A partial solar eclipse is a natural phenomenon that prompts people around the world to turn their eyes to the sky. However, this astronomical event can have adverse effects on your vision and eye health, even causing permanent vision damage or blindness, if you fail to take the proper precautions.
There are a number of safeguards to be aware of when planning to observe an eclipse. First and foremost, ensure that you have the correct tools to protect your eyes during the event. Ordinary sunglasses do not provide adequate protection for viewing the sun. Instead, acquire eclipse glasses or hand-held solar viewers containing solar filters that meet the international standard for solar viewing equipment, ISO 12312-2.
It is only safe to view an eclipse without protective gear when the moon has completely covered the sun. This is known as the totality phase of the eclipse, and is the only portion of the event that does not pose a risk to your retina. However, depending on your geographic location, you may not experience this phase.
Before using a solar viewer or pair of eclipse glasses, remember to carefully read all instructions. In addition, never view a solar eclipse through a separate device with a lens, such as a camera or telescope. These devices can allow solar rays to pass through their lenses and damage the human eye, even with the added protection of a solar filter.
