This is normal, Amy. Staring at anything for an extended period leaves a temporary "imprint" on the retina; this is because different visual pigments are consumed in different proportions in different areas of the retina. Then, when you look away or fixate on something else, the sensitivity of the retina to certain colours is momentarily altered, making a ghost imprint of what you were seeing before appear before your eyes. It should disappear in a few seconds.
Your eyes are fine!
This is normal, Amy. Staring at anything for an extended period leaves a temporary "imprint" on the retina; this is because different visual pigments are consumed in different proportions in different areas of the retina. Then, when you look away or fixate on something else, the sensitivity of the retina to certain colours is momentarily altered, making a ghost imprint of what you were seeing before appear before your eyes. It should disappear in a few seconds.