Fish Eyeball Anatomy

Pupil shape varies and may be eg. Fish have a cornea or outer covering a lens for taking a picture an iris for adjusting light a retina containing light sensitive cells and an optic nerve for translating the picture to the brain.

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The iris the colored part of the eye controls how much light the pupil lets in.

Fish eyeball anatomy. The adaptive capacity of fish is so great that some migratory species change the eyes anatomy according to the environment. Most fish species seem to have a fixed pupil size but elasmobranches like sharks and rays have a muscular iris which allows pupil diameter to be adjusted. If you cut away this protective layer you can see how the optics of a fish eye work.

The fishs eye is often found between the gill plate and the mouth behind the nostrils. It can be contrasted with fish physiology which is the study of how the component parts of fish function together in the living fish. The choroid also known as the choroidea or choroid coat is the vascular layer of the eye.

Is a transparent gelatinous fluid similar to plasma. In freshwater is porphiropsin red and in the sea is rhodopsin blue. As stated fish dont have eyelids like we do except sharks kind of but instead often have a translucent covering to protect their eyes that of course never dries out.

Next light passes through the lens a clear inner part of the eye. Fish anatomy is the study of the form or morphology of fishes. The lens works together with the cornea to focus light correctly on the retina.

The lampreys for example are fishes that migrate from rivers to the sea. Light enters the eye at the cornea passing through the pupil to reach the lens. Fish eyes contain many of the same components as human eyes but they are structured and used differently.

Fish eyes are broadly similar to those of other vertebrates notably the tetrapods amphibians reptiles birds and mammals all of which evolved from a fish ancestor. In fish the lens is usually sphere shaped and rigid and protrudes into the pupil opening a very different arrangement than the lens of the human eye which is almost flattened and positioned behind the pupil. The iris of the fishs eye is normally immovable in teleosts.

Anatomy of a fishes eye aqueous humour. Behind the iris is the most noteworthy feature of the fish eye the lens. In some deep water fish the eyes are very large with large lenses focusing on small retinas.

In practice fish anatomy and fish physiology complement each other the former dealing with the structure of a fish its organs or component parts and how they are put together such as might be observed on the dissecting table or under the microscope and the latter dealing with how those components. They have a different pigment for each environment. Some of this light enters the eye through an opening called the pupil pyoo pul.

Bottom dwelling fish who eat off the bottom or sift through sand may have eyes on the top of their head. The cornea is shaped like a dome and bends light to help the eye focus. This greatly increases the eyes sensitivity to light in myctophium rissoi the diametre of the the anterior part of the eye is equal to 50 the length of the head of the fish.

The location of the eye on a fish and the type of food it eats seem connected.

Anatomy Of The Human Eye Vertical Section Of The Eye And Eyelids