Cuttlefish Eye – Why do Cuttlefish have Weird Eyes?

cuttlefish eye
(Last Updated On: August 5, 2020)

The cuttlefish eye (Sepia officinalis) has a modified horizontal slit-spill distinctly W-shaped in bright light, the doll round in the dark. This allows us to determine the shape of the student and the light-recognizable area for different parts of the visual field, and illuminate in the dark.

Like other cephalopods, the eyes of the cuttlefish are also sophisticated with its w shaped eye. The cuttlefish is a smoothly curved W-shape. Although cuttlefish cannot see color, they understand the polarization of light, which enhances their perception of contrast.

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How Does cuttlefish eye works?
A beam divider indicates the light emitted from an infra-red LED to the eye of a cauldron, where the lens focuses the beam on the retina. A student in bright light is seen on camera (set in night-shot mode).

Cuttlefish still have the most acute polarizing vision in any animal, researchers at the University of Bristol have discovered by showing movies on a modified LCD computer screen to test their sight.

Look at the sides of light with cuttlefish and their colorblind cousins, squid and octopus, polarized light – which are invisible to humans, giving them a secret communication channel. A Bristol study published today in Current Biology found that cuttle fish were far more sensitive to polarization than previously thought.

cuttlefish eye (Sepia officinalis)

A leading researcher at the Ecology of Vision Laboratory at the University of Bristol. The Shelby Temple says: “Polarization like color and intensity is one aspect of light that can provide information about the world around animals. If a polarized sunglasses glasses are cut to catch a glimpse from the water or the road, then you have polarized light. Noticed some aspects “

High definition polarization vision has been discovered in cuttle fish. Polarization of a cuttlefish is a shrimp seen through sensitive eyes. On the left is how it looks to us, on the right it can look at a colorblind catfish or octopus that shows polarization angles but not color. The false colors given in the triangle shown at the top left represent different polarization angles. Credit: Shelby Temple, University of Bristol.

Together with the Associates of Queensland University in Brisbane, Australia, the team has given an eye test to cuttlefish; Instead of measuring their significance, however, they have measured the smallest difference in the angle of polarization that cuttlefish can detect.

Since the team couldn’t ask what the catfish would look like, they used the kettle fish to poison the animals that took the opportunity to change the color of the beef to measure whether it could detect polarized stimuli.

“We modified the LCD computer monitors to show changes in polarization instead of color changes, and then played videos that came to the object and monitored for skin color changes so that the catfish could see minor changes as opposed to polarization types,” Dr. “Cuttlefish change color all the time and respond to the slightest movement so they are a great model.

“cuttlefish were much more sensitive than we expected. Earlier it was hypothesized that polarization sensitivity was limited to about 10-20 degrees difference, but we found that cuttlefish could respond to differences as small as one degree.”

In addition to measuring the extent of the polarization aspect of the cuttlefish, the team also modeled how submerged water scenes could look at an animal that had such high-resolution polarization vision. Instead of changing the angles of the polarization, they created images of the polarized world that people could see and showed that much more information was already known at polarization levels.

cuttlefish eye (Sepia officinalis)

Professor Justin Marshall, co-author of The University of Queensland, says: “These remarkable studies suggest that we need to examine how the visual world is measuring underwater. Cuttlefish were using polarization of light, such as color, which means that we are” in a whole new way. We need to look at the bottom of the camouflage and the contact floor. “

Animals like cuttlefish and Octopus can quickly change colors to blend in the background and shine on potential mates. But there is only one problem: as far as we know, they will not be seen in color. Unlike our eyes, cephalopods’ eyes – catfish, octopus and their relatives – contain only one type of color-sensitive protein, which apparently limits them to the black and white view of the world. However a new study shows how they can.

By rapidly focusing them at different depths, cephalopods can adopt a lensing property called “chromatic blur” Each color of light has different wavelengths – and because the lens bends some wavelengths more than others, the light through one color shines through another.

In this case, the lens may be in focus. So with the right eye, the sharp shake of focus diminishes the true color of an object when it blurs, according to a study published this week on Proceedings of the National Academy of Sciences, with many W-shaped pupils of catfish (off-cephalopods).

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The students exaggerated this vague effect. In that study, the scientists created a computer model of an octopus eye and showed that – at least for a given body length – it can determine the color of an object by simply changing focus. Since this is still theoretical, the next step is testing whether live cephalopods actually show color this way – and any other “colorblind” creature could possibly do the testing.

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