Look Into My Eyes
Let’s have some "fun" with this one. This is a fundus. No, no, it’s not a typo, nor are we begging for money. The fundus is the back portion of the interior lining of your eyeball, including the retina, optic disc (the nerve that connects the eyeball to the brain), and the macula (the center of the retina). The fundus can be seen during an eye exam by looking through an Ophthamoscope, allowing the doctor to examine the retina and optic disc. The orange glowing interior is the retina, the yellow circle is the optic nerve, and the red dot is the macula.

While the iris is the colored part of the eye, depending on pigment for more or less color, the fundus also has a pigment. Fundus pigmentation can help determine the risks of certain cancers and diseases. Cancer lesions can also form on the fundus, making it a good idea to let your doctor look deep into your eyes.

Image courtesy of the National Eye Institute, NIH.