The planaria is a flatworm with two eye “cups” that help it avoid light. These sensors form a simple retina, but do not give good vision.
Here is a closeup of the planaria eyes. The simple bowl configuration allows them to detect the direction of light.
Planaria have been placed in this petri-dish and a flashlight is used. The planaria run away from the light and congregate on the other side of the dish.
These snapshots were drawn from our Comparative Eye Anatomy Lecture. If you’d like to watch these planaria on video as they run away from light, you might want to watch the video!
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