Mollusc eye

Molluscs are animals that come in many shapes and sizes, from snails to octopuses. Like us humans, they have eyes that allow them to see the world around them. However, the way their eyes work is a little different from ours.

The mollusc eye is made up of a special structure called the "eyecup". This is basically a little bowl that sits on top of the mollusc's head, and inside the eyecup there is a layer of cells called the "retina". The retina is what allows the mollusc to see.

Now, unlike our eyes which have a round pupil that can shrink or expand to let light in, the mollusc eye has a fixed aperture or opening. This means that the amount of light that enters the eye is always the same.

To make up for this, the mollusc eye has a very large number of "photoreceptor cells" in the retina. These cells are the ones that detect light and send signals to the brain to create an image. In fact, some molluscs can have up to a million photoreceptors in their eyecup!

Another interesting thing about the mollusc eye is that it can detect both light and shadows. This is because the photoreceptor cells are very sensitive to changes in light intensity, which allow the mollusc to detect movement or changes in its environment.

So, even though the mollusc eye is a little different from ours, it is still an amazing organ that allows these creatures to see the world in their own unique way.