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The nictitating membrane is a third eye lid which moves horizontally over the eye. Its function is to protect the eye and clean the eyes. it is mostly functional in birds and reptiles. whereas it became a vestigial organ in most of the mammals. In fishes and amphibians also the nictitating membrane is present and here it reduces the friction with water.
The nictitating membrane is a protective, semi-transparent third eyelid. It allows vision while giving the eye extra protection. In the case of frogs, the protection is needed when the frog is out of the water.

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9y ago
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6mo ago

The nictating membrane is a transparent or translucent third eyelid found in some animals, such as birds, reptiles, and mammals like camels and whales. It helps protect the eye, keep it moist, and improve vision in some cases.

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13y ago

It sweeps and cleans the eye of debris. It also allows the frog to see clearly under water by shielding the eyes (similar to swimming goggles over one's eyes).

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10y ago

The nictitating membrane is a semi-transparent third eyelid that functions as added protection for the eyes. It also helps in keeping the eyes moist.

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15y ago

since frogs do not have any eye lids so they cannot blink. fr the protection of eye there is a membrane called nicitating membrane present on the eye surface which does not move.

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13y ago

It serves as a clear covering for when they are swimming as to not get debris in their eyes.

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Q: What is the purpose of nictating membrane?
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Which is a transparent membrane in eye?

It is called a nictating membrane.


What is the third eyelid of a bald eagle called scientificly?

It is called a nictating membrane.


What is the clear film starting to cover your eyeball from the lower left corner of your eyelid?

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This is called the third eye lid. It will sweep the eye from time to time to clean it. It is also called a nictating membrane.


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Don't know what you mean by 'serious.' Do you mean 'serous' as in fluid-filled? The membrane that can cover over a frog/toad's eyes (and other amphibian, reptile, even mammal species) is known as a 'nictating' membrane. It is there to protect against fluid and debris from coming into contact with the corneal surface of those eyes.


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Don't know what you mean by 'serious.' Do you mean 'serous' as in fluid-filled? The membrane that can cover over a frog/toad's eyes (and other amphibian, reptile, even mammal species) is known as a 'nictating' membrane. It is there to protect against fluid and debris from coming into contact with the corneal surface of those eyes.