3 d lesson framework human eye_combined-1
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The human eye is a spherical structure located in the eye socket. It contains six muscles that control eye movement and vision - four rectus muscles and two oblique muscles. The main layers of the eye are the sclera, choroid, and retina. The ciliary body contains the ciliary muscle and ciliary processes that help produce aqueous humor. Vitreous humor is a clear gel that fills the space behind the lens. Light enters through the cornea and passes through the iris and pupil, which control the amount of light entering. The lens focuses light onto the retina, and the optic nerve transfers this visual information to the brain.
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Focuses an image by refracting, or bending the light rays using cornea and the lens. At the yellow spot of retina an inverted image is formed. Most of the refraction of light occurs in cornea due to its curved surface.
9 eye
The sense organs allow us to perceive both external and internal environments. The major sense organs are the eyes, ears, tongue, nose, and skin, which detect light, sound, taste, smell, and touch respectively. Sensory cells called receptors located in these organs perceive sensations and are categorized based on the organ they are located in.
Sense organs
he sense organs — eyes, ears, tongue, skin, and nose — help to protect the body. The human sense organs contain receptors that relay information through sensory neurons to the appropriate places within the nervous system.
Each sense organ contains different receptors.
General receptors are found throughout the body because they are present in skin, visceral organs (visceral meaning in the abdominal cavity), muscles, and joints.
Special receptors include chemoreceptors (chemical receptors) found in the mouth and nose, photoreceptors (light receptors) found in the eyes, and mechanoreceptors found in the ears.
The human eye
The human eye is an organ that reacts to light in many circumstances. As a conscious sense organ the human eye allows vision; rod and cone cells in the retina allow conscious light perception and vision, including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.
The Human Eye
The human eye is like a camera that takes in light and forms an image on the retina. It has several main parts including the cornea, iris, pupil, lens, retina, and optic nerve. The cornea and lens work together to refract light and focus it onto the light-sensitive retina. The retina then converts the light into neural signals that are sent to the brain via the optic nerve. Common defects of the eye that affect vision include near-sightedness, far-sightedness, cataracts, and presbyopia. These defects can typically be corrected using lenses in glasses or contact lenses.
Structure, parts and fumctions of the human eye
The human eye is an organ that reacts to light in many circumstances. As a conscious sense organ, the human eye allows vision; rod and cone cells in the retina allow conscious light perception and vision, including color differentiation and the perception of depth. The human eye can distinguish about 10 million colors.
SHAHID KHAN AZMI.organ of vision and pathway of vision.ppt
The eye is the main organ of vision. Light enters through the cornea and pupil and is focused by the lens onto the retina. The retina converts the light into neural signals which are transmitted through the optic nerve to the visual cortex of the brain, where an image is formed. The eye contains several parts including the iris, ciliary body, retina, sclera, choroid and optic nerve. Nutrients like vitamins A, C, lutein and zeaxanthin obtained from foods help support eye health and protect against vision problems.
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3 d lesson framework human eye_combined-1
- 4. THE HUMAN EYE The human eye is the organ of vision and light perception. The eye is a spherical structure which fits in the eye socket in the skull bone. It can be treated as an optical instrument. © EON Reality, v1.2
- 5. HUMAN EYE : RECTUS & OBLIQUE MUSCLES The rectus muscles arise from a fibrous ring that encircles the optic nerve at the optic foramen and are attached to the sclera. Six Rectus muscles outside the eye govern its movements. They are the four rectus muscles: 1) lateral, 2) inferior, 3) superior, 4) medial — and the 5) superior and 6) inferior oblique muscles. © EON Reality, v1.2
- 6. HUMAN EYE : MAIN LAYERS SCLERA Sclera : CHOROID RETINA an opaque layer of the eye that offers a surface for attachment to the intrinsic muscles of the eye. Choroid : part of the Uveal tract extending from the edge of the optic nerve head to the oar serrate. Retina : is a light-sensitive layer at the back of the eye that covers about 65 percent of its interior surface. © EON Reality, v1.2
- 7. HUMAN EYE : CILIARY BODY The ciliary body is the circumferential tissue inside the eye composed of the ciliary muscle and ciliary processes. CILIARY BODY It is triangular in horizontal section and is coated by a double epithelial layer which produces the aqueous humor. © EON Reality, v1.2
- 8. HUMAN EYE : VITREOUS HUMOR OPHTHALMOSCOPE IMAGE OF VITREOUS HUMOR The vitreous humor comprises a large portion of the eyeball. It is a clear gel that occupies the space behind the lens and before the retina at the back of the eye. Because the eye must process visual data, this liquid must be clear enough that light can easily pass through. © EON Reality, v1.2
- 9. HUMAN EYE : CORNEA The cornea is the clear, protective outer layer of the eye. Attached to the sclera, it is capable of filtering out some amount of the sun's ultraviolet light. IRIS CORNEA PUPIL The colored part of the eye is called the iris. It controls light levels inside the eye. The iris is embedded with tiny muscles that dilate (widen) and constrict (narrow) the pupil size. © EON Reality, v1.2 The pupil is the black circle in the middle of the eye. The primary function of the pupil is to control the amount of light entering the eye.
- 10. HUMAN EYE : FOCUSING SYSTEMS The lens is composed of transparent, flexible tissue and is located directly behind the iris and the pupil. LENS It can change its curved shape to focus on objects and people that are either nearby or at a distance. © EON Reality, v1.2
- 11. HUMAN EYE : OPTIC NERVE The optic nerve is located in the back of the eye. It is the second of several pairs of cranial nerves. CROSS-SECTION OF BRAIN OPTIC TRACT OPTIC NERVE CHASM OPTIC NERVE It transfers visual information from the retina to the vision centers of the brain via electrical impulses through the neural pathway to the brain. © EON Reality, v1.2