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Apr 29, 2023 · These three layers together are called the tear film. The mucous layer is made by the conjunctiva. The watery part of the tears is made by the lacrimal gland. The eye’s lacrimal gland sits under the outside edge of the eyebrow (away from the nose) in the orbit. The meibomian gland makes the oil that becomes another part of the tear film.
- Peripheral Retina
A number of eye problems can affect the peripheral retina...
- Macula
A number of eye problems can affect the macula and can lead...
- Vitreous
Vitreous - Eye Anatomy: Parts of the Eye and How We See -...
- Lacrimal Gland
Lacrimal Gland - Eye Anatomy: Parts of the Eye and How We...
- Eye Muscles
The other four muscles move the eye up, down, and at an...
- Night Vision
Night vision is the ability to see in low light conditions....
- Drainage Angle
Drainage Angle - Eye Anatomy: Parts of the Eye and How We...
- Rods
Rods are a type of photoreceptor cell in the retina.They are...
- Peripheral Retina
After passing through the cornea, light enters the anterior and posterior chambers of the eye. These chambers are separated by the iris, the colored part of the eye. A water-like liquid called aqueous humour fills these chambers and bathes the iris and the lens with plenty of nutrients. Moving on, we reach the natural lens within the eye.
Mar 16, 2024 · Eye anatomy consists of various parts that make it a prime and important human body part. There are two main types of eyes: compound and non-compound. Compound eyes, found in insects, have many small visual units.
- Tear Film
- Cornea
- Anterior Chamber
- Iris
- Lens
- Vitreous
- Retina
- Optic Nerve
- Eyelids
- Conjunctiva
Many people may not actually think of the tear film as a “structure”, but it does serve an important function for the eye: it keeps our eye from drying out. The tear film consists of three different layers: 1. The bottom-most layer is a mucus layerthat binds the tear film to the cornea below. 2. The bulk of the tear film is an aqueous or watery lay...
Below the tear film is the cornea. And now we are on to the actual “structures”. The cornea is divided into different layers. From front to back, this includes the epithelium, stroma and endothelium. The epitheliumis the “skin” on the cornea. It protects the rest of the cornea from bacteria and other pathogens. It also allows our eye to feel comfor...
After passing through the cornea, light enters the anterior chamber of the eye. This space exists between the cornea and the lens and is filled by a water-like liquid called aqueous humor. This aqueous humor is produced in a structure behind the iris called the ciliary body. It flows from the ciliary body through your pupil and out through the corn...
Within the anterior chamber is the iris. This is the colored part of our eye. The black hole in the middle of the iris is called your pupil. The main role of the iris is to regulate how much light enters our eye. When we are in a dark environment, the iris dilates to allow more light into our eye. When we are in a bright environment, the iris const...
Next up is the natural lens. The lens provides the remaining 1/3 of the focusing power of the eye. When we are young, this lens also can change its focus and allow us to read up close. Remember the ciliary body? It doesn’t just produce aqueous. It also attached to the natural lens and controls the shape of it. When we want to read up close, the cil...
The vitreous is the largest structure in the eye. It is the jelly-like substance in between the lens and the retina. Similar to the aqueous humor, the vitreous humor is also a source of nutrients. But unlike aqueous humor, when our eye is growing, the vitreous supports the structure of the eye. Conditions involving the vitreous: 1. Posterior Vitreo...
We’ve passed through all the transparent structures of the eye and finally made our way to the retina. The retina receives light and transforms that light into electrical nerve signals to send to our brain. How cool! Within the retina are specialized cells called photoreceptor cells. When light hits these photoreceptors, it causes an electrical cha...
Alas, we are on the final stop on the visual pathway tour of the eye - the optic nerve. Light processed from the retina travels through the optic nerve on its way to the brain. (fun fact: the optic nerve is actually part of the brain itself) Conditions that involve the optic nerve: 1. Glaucoma. While in most cases glaucoma is more of an issue relat...
The eyelids serve two primary functions: 1. Protect the eye. What is your reaction if an object comes toward your eye? You close your eyes. Whatever is coming towards your eye has to hit your eyelid first before it can get to your eye. The eyelid is working to protect the eye. 2. Replenish the tear film 2.1. Each blink of the eyelid works like a sq...
This is the white part of our eye. It extends from underneath our eyelids to our cornea. The conjunctiva serves an important role in protecting our eye from the outside world. And it’s flexible enough to allow us to move our eye around. Conditions that involve the conjunctiva: 1. Conjunctivitis or pink eye. This is an infection of the conjunctiva. ...
May 30, 2018 · The lacrimal glands constantly make a small amount of watery fluid which drains on to the upper part of the eyes. When you blink, the eyelid spreads the tears over the front of the eye. Tiny glands in the eyelids (meibomian glands) make a small amount of lipid liquid which covers the outer layer of the tear film.
Aqueous humor: Aqueous means related to water and humor is fluid. This watery stuff fills the front of the eyeball around the lens. Blindspot: This is a tiny part of the retina that is not sensitive to light. It is the spot where the optic nerve joins the retina. Blood vessels: serve to bring oxygen and nutrients to the nerve cells.
The eye is made up of three coats, or layers, enclosing various anatomical structures. The outermost layer, known as the fibrous tunic , is composed of the cornea and sclera , which provide shape to the eye and support the deeper structures.
