The choroid is a layer of tissue located in the back of the eye, between the retina and the sclera. It is rich in blood vessels that provide oxygen and nutrients to the retina, helping to nourish and support its function. The choroid also helps to regulate the amount of light entering the eye by absorbing excess light and reducing glare. Additionally, it contains pigments that contribute to the eye's coloration. The choroid plays a crucial role in maintaining the health and proper functioning of the eye.

What is "choroid"?

choroid

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The ciliary body is a component of the eye located behind the iris. It is a singular structure that plays a crucial role in vision. The ciliary body consists of muscles that control the shape of the lens, enabling the eye to focus on objects at various distances. Additionally, it produces the aqueous humor, a fluid that nourishes the eye and helps maintain its shape. The ciliary body's ability to adjust the lens and regulate fluid contributes to clear vision and optimal intraocular pressure.

What is "ciliary body"?

ciliary body

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The cornea is the transparent, dome-shaped layer at the front of the eye that covers the iris and pupil. It plays a crucial role in refracting and focusing light onto the retina, allowing us to see clearly. The cornea is composed of specialized cells and is responsible for most of the eye's focusing power. It is essential for maintaining the integrity of the eye and protecting it from external elements.

What is "cornea"?

cornea

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The fovea is a small, central pit located in the retina of the eye. It is responsible for sharp central vision and the perception of fine details. The fovea contains a high concentration of cone cells, which are specialized photoreceptor cells that are sensitive to light and responsible for color vision and visual acuity. Its location in the center of the retina allows for precise and detailed vision when looking directly at an object. The fovea plays a crucial role in activities that require precise vision, such as reading, driving, and recognizing faces.

What is "fovea"?

fovea

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The iris, a thin circular structure in the eye, contains pigments that give it color and helps control the amount of light that enters the eye through the pupil. It acts like a diaphragm, expanding or contracting to adjust the size of the pupil and regulate the amount of light reaching the retina. The unique pattern and color of the iris are used for identification purposes, making each person's iris distinct and individual.

What is "iris"?

iris

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The lens, a flexible and transparent structure in the eye, contributes to the process of focusing light onto the retina. It works in conjunction with the cornea to refract incoming light, allowing for the formation of clear images. By adjusting its shape, the lens accommodates varying distances, enabling us to see objects up close or at a distance with clarity. Its function is vital for visual acuity and the perception of depth and detail.

What is "lens"?

lens

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The macula, a small but critical region in the center of the retina, is responsible for central vision and visual acuity. It contains a high concentration of specialized photoreceptor cells called cones, which are responsible for color perception and detailed vision. The macula allows us to see fine details, read, recognize faces, and perform tasks that require sharp, focused vision. It plays a crucial role in our daily activities that require precise visual discrimination and clarity.

What is "macula"?

macula

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The pupil, a crucial part of the eye, acts as a gateway for light to enter the inner structures. It is a dynamic, adjustable opening surrounded by a colored iris. The size of the pupil is regulated by the iris muscles, which contract or dilate in response to varying light levels. In bright conditions, the pupil constricts to limit the amount of light, protecting the delicate structures of the eye. Conversely, in dim lighting, the pupil dilates to allow more light to enter, enhancing visual sensitivity. Through its adaptable nature, the pupil plays a vital role in regulating the amount of light reaching the retina, ensuring optimal vision in different environments.

What is "pupil"?

pupil

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The retina, located at the back of the eye, is a thin, light-sensitive layer that plays a crucial role in vision. It contains specialized cells called photoreceptors, including rods and cones, which convert light into electrical signals. These signals are then transmitted to the brain through the optic nerve, where they are processed and interpreted as visual information. The retina's intricate structure and arrangement of photoreceptor cells enable the perception of colors, shapes, and details, forming the foundation of visual perception. It acts as a vital sensory component, allowing us to see and perceive the world around us.

What is "retina"?

retina

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The sclera, often referred to as the "white of the eye," is the tough, protective outer layer that covers most of the eyeball. It is composed of dense connective tissue and helps maintain the shape and integrity of the eye. The sclera provides attachment points for the muscles that control eye movement and serves as a barrier to protect the delicate structures inside the eye. It also plays a role in maintaining eye pressure and providing structural support. While it is primarily white, the sclera may have a slightly bluish tint in some individuals. Overall, the sclera serves as a vital component of the eye, contributing to its overall function and protection.

What is "sclera"?

sclera

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Vitreous humor is a gel-like substance that fills the space within the eye, providing support and maintaining the shape of the eyeball. It is composed mostly of water and collagen fibers, and it helps transmit light to the retina at the back of the eye. The vitreous humor also plays a role in maintaining the overall health of the eye and contributes to its optical properties.

What is "vitreous humor"?

vitreous humor

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The tear duct, or lacrimal duct, is a delicate channel located near the inner corner of the eye. Its primary function is to transport tears from the surface of the eye to the nasal cavity. Tears, which contain water, salts, proteins, and antibodies, help keep the eyes lubricated and free from debris. The tear duct serves as a pathway for the drainage of tears, ensuring proper eye health and comfort. When we cry or experience emotional or physical stimulation, the tear duct plays a crucial role in releasing tears and allowing emotional release.

What is "tear duct"?

tear duct

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The eyeball is a complex sensory organ located within the eye socket. It consists of various structures that work together to facilitate vision. The outermost layer, the sclera, provides protection and maintains the shape of the eyeball. The cornea, a transparent dome-shaped structure, refracts light entering the eye. Behind the cornea, the iris controls the amount of light reaching the inner structures. The lens further refracts light to focus it onto the retina. The retina, composed of specialized cells, detects light and converts it into electrical signals. These signals are then transmitted to the brain via the optic nerve, allowing us to perceive visual information. The eyeball is a remarkable organ that enables us to see and interpret the world around us.

What is "eyeball"?

eyeball

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Eyelashes are short, curved hairs that grow along the edges of the eyelids. They serve as a protective barrier for the eyes, helping to keep out dust, debris, and foreign objects. The eyelashes are also essential in preventing excessive light from entering the eyes, reducing glare, and providing shade. Additionally, eyelashes play a crucial role in enhancing the aesthetics of the eyes, adding definition and framing to the face. Their delicate structure and sensitivity make them responsive to touch, triggering a reflex action to blink when something comes into contact with them. Overall, eyelashes contribute to the health, function, and beauty of the eyes.

What is "eyelash"?

eyelash

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The eyelid is a movable skin fold that covers and protects the delicate structures of the eye. It consists of thin layers of skin, muscles, and connective tissue. The primary function of the eyelid is to shield the eye from external factors such as dust, light, and foreign objects, while also helping to distribute tears across the surface of the eye. The eyelids can blink rapidly to keep the eye moist and to clear away any irritants. Additionally, the eyelids play a role in expressing emotions, such as blinking in response to bright light or closing during sleep.

What is "eyelid"?

eyelid

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The optic disc, also known as the optic nerve head, is a vital structure located at the back of the eye where the optic nerve connects to the retina. It appears as a circular or oval-shaped area that is paler in color compared to the surrounding retina. The optic disc plays a crucial role in vision as it serves as the entry point for nerve fibers that carry visual signals from the retina to the brain. Additionally, it lacks photoreceptor cells, making it a blind spot in our visual field. Through careful examination of the optic disc, healthcare professionals can assess the health of the optic nerve and detect any abnormalities or signs of eye conditions such as glaucoma.

What is "optic disc"?

optic disc

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A rod cell, found in the retina of the eye, is a highly specialized sensory cell that plays a crucial role in our ability to see in dim light. Its distinctive structure consists of a long, slender shape with numerous light-sensitive pigment molecules called rhodopsin. When exposed to light, these pigments undergo a chemical reaction, triggering a series of electrical signals that are transmitted to the brain, ultimately leading to visual perception. Rod cells are particularly abundant in the peripheral regions of the retina, making them essential for our night vision and peripheral vision capabilities. Their remarkable sensitivity to light allows us to navigate and perceive our surroundings even in the absence of bright illumination.

What is a "rod cell"?

rod cell

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A cone cell, located in the retina of the eye, is a specialized photoreceptor responsible for our color vision and visual acuity in brighter light conditions. Shaped like a cone, these cells contain light-sensitive pigments that respond to different wavelengths of light, enabling us to perceive a wide range of colors. Cone cells are concentrated in the central region of the retina called the fovea, which is responsible for our sharp and detailed vision. They are sensitive to red, green, and blue light, and their combined activity allows us to perceive a full spectrum of colors and distinguish fine details in our visual environment. Cone cells play a crucial role in our everyday visual experiences, such as appreciating vibrant colors, recognizing faces, and reading.

What is a "cone cell"?

cone cell

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Aqueous humor, also known as intraocular fluid, is a transparent liquid that fills the anterior chamber of the eye. It is constantly produced and drained to maintain a healthy balance of pressure within the eye. The aqueous humor nourishes the cornea and lens, supplies oxygen and nutrients to the surrounding tissues, and helps remove waste products. It also plays a crucial role in maintaining the shape and optical properties of the eye, contributing to clear vision.

What is "aqueous humor"?

aqueous humor

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The anterior chamber of the eye is a fluid-filled space located between the cornea and the iris. It contains a clear, watery fluid called aqueous humor, which helps maintain the shape and pressure of the eye. The anterior chamber plays a vital role in the circulation of nutrients and oxygen to the cornea and lens, ensuring their health and proper functioning. Additionally, it contributes to the refraction of light, allowing for clear vision and proper focusing.

What is "anterior chamber"?

anterior chamber

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The posterior chamber is a small, fluid-filled compartment situated between the iris and the lens in the eye. It contains a clear, watery fluid called aqueous humor, which helps nourish and maintain the health of the surrounding structures, as well as contributes to the intraocular pressure. The posterior chamber also serves as a pathway for the circulation of nutrients and waste products within the eye.

What is "posterior chamber"?

posterior chamber

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The conjunctiva is a mucous membrane that lines the front surface of the eye and the inner surface of the eyelids. It acts as a protective barrier, shielding the delicate structures of the eye from external irritants and infections. The conjunctiva also contains tiny blood vessels that supply oxygen and nutrients to the eye tissues. Additionally, it produces a thin layer of mucus and tears that helps lubricate the eye, ensuring smooth blinking and reducing friction. Overall, the conjunctiva plays a vital role in maintaining the health and proper functioning of the eyes.

What is "conjunctiva"?

conjunctiva

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The ora serrata is the boundary region between the retina and the ciliary body in the human eye. It is characterized by a jagged or serrated appearance, hence its name. This area marks the transition from the sensory retina, responsible for visual perception, to the ciliary body, which plays a role in accommodating the lens for focusing. The ora serrata contains the last row of photoreceptor cells in the retina, known as the retinal ora, before transitioning to the non-photosensitive ciliary epithelium. Its unique structure and location make the ora serrata an important anatomical landmark in the eye.

What is "ora serrata"?

ora serrata

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Schlemm's canal, also known as the trabecular meshwork, is a circular channel located in the eye's anterior chamber angle. It plays a crucial role in the drainage of aqueous humor, the fluid that nourishes the cornea and maintains intraocular pressure. Schlemm's canal acts as a drainage pathway, allowing excess fluid to flow out of the eye and maintain a healthy balance of intraocular pressure. It is lined with specialized endothelial cells and is surrounded by a network of trabecular meshwork, which filters and regulates the outflow of aqueous humor. Dysfunction or blockage of Schlemm's canal can lead to increased intraocular pressure and contribute to the development of glaucoma.

What is "schlemm's canal"?

schlemm's canal

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Here you will learn some English words related to the eye, such as "eyeball", "tear duct", and "retina".

كلمات إنجليزية لـ "العين"