The physiology of human eye
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The physiology of the human eye involves several key structures working together. The eye receives light stimuli which is transformed into nerve impulses along the optic nerve to the visual cortex where it creates visual sensation. The external structures include the eyelids, conjunctiva, extraocular muscles, and bony orbit. Internally, the eye contains the iris, pupil, lens, vitreous humour, retina, aqueous humour, optic nerve and blood vessels which work to focus light, transmit signals to the brain and provide nourishment to the eye. The retina in particular contains light-sensitive rod and cone cells that convert light energy into electrical signals.
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Physiology of the eye
This ppt file belongs to Mr. Yonas Akalu one of my best instructors ...
Vision is by far the most used of the five senses and is one of the primary means that we use to gather information from our surroundings. More than 75% of the information we receive about the world around us consists of visual information.
The eye is often compared to a camera. Each gathers light and then transforms that light into a "picture." Both also have lenses to focus the incoming light. Just as a camera focuses light onto the film to create a picture, the eye focuses light onto a specialized layer of cells, called the retina.
The human eye is an organ which reacts to light and pressure. As a sense organ, the mammalian eye allows vision. Human eyes help to provide a three dimensional, moving image, normally coloured in daylight. 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 differentiate between about 10 million colors[1] and is possibly capable of detecting a single photon.
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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.
Anatomy_and_Physiology_of_eye.pptx
The document describes the anatomy and functions of the human eye. It discusses the three layers that make up the eye - fibrous, vascular, and nervous tunics. The fibrous tunic includes the sclera and cornea. The vascular tunic contains the iris, ciliary body, and choroid. The nervous tunic is the retina. It also describes the accessory structures that protect the eye, such as eyebrows, eyelids, and tear glands. The main components of the eye are described in more detail, including the lens, chambers, humors, muscles, and retina's photoreceptors. Eye disorders like myopia, hyperopia, and glaucoma are also mentioned.
Anatomy of eye neelesh
Anatomy of Eye explained using simple Termonolgy and Images.
Easy to understand the basic functioning of parts of eye.
eye.pptx
The eye has three layers - an outer fibrous layer, middle vascular layer, and inner nervous tissue layer. The outer layer includes the sclera and transparent cornea. The middle layer is made up of the choroid, ciliary body, and iris. The inner layer is the retina. The ciliary body secretes aqueous fluid and controls the lens thickness through contraction of the ciliary muscles. The iris lies in front of the lens and controls the size of the pupil through sympathetic and parasympathetic nerves. The retina contains light-sensitive rods and cones that convert light into nerve impulses.
ANATOMY OF EYE n.pdf
The eye is a spherical organ that allows for vision. It has three layers - an outer fibrous coat, middle vascular coat, and inner nervous coat containing photoreceptor cells. Light enters through the cornea and is focused by the lens onto the retina. Photoreceptor cells in the retina convert light into neural signals via the optic nerve. Accessory structures like the eyelids and lacrimal system help protect and lubricate the eye. Common refractive errors that impact vision like myopia, hyperopia, and astigmatism can often be corrected using lenses.
ocular anatomy of eye for optometry and optalomolgy
The document summarizes the key anatomical structures of the eye, including the outer protective layers like the sclera and cornea, middle uveal layer containing the iris and choroid, inner retinal layer containing photoreceptors, and associated structures like the lacrimal system and extraocular muscles. The summary provides a high-level overview of the essential anatomical components and their functions in 3 sentences.
ocular_anatomy.pptx
The document summarizes the key anatomical structures of the eye, including the outer protective layers like the eyelids, sclera, and cornea. It describes the inner layers like the iris, ciliary body, choroid, retina, and optic nerve. It explains the functions of various parts like tear production, intraocular fluid circulation, and the conversion of light to neural signals in the retina.
structureofeyeppt-190302154704 (1).pdf
This document provides an overview of the structure of the eye. It describes the three layers that make up the wall of the eyeball: the outer fibrous coat, middle vascular coat, and inner nervous coat. It also outlines the main refractive media - the aqueous humor, vitreous humor, and lens. In under 3 sentences, the document summarizes the key layers and components of the eyeball structure.
structure of eye
The eye is composed of three layers - an outer fibrous coat, middle vascular coat, and inner nervous coat. The outer coat includes the sclera and cornea. The middle coat contains the choroid, ciliary body, and iris. The inner coat is the light-sensitive retina. Between these layers are the aqueous humor and vitreous humor, and a lens focuses light onto the retina to form images.
ocular_anatomy.pptx
The document summarizes key anatomical structures of the eye. It describes that the eye is surrounded by the bony orbit formed by 7 bones. It also describes key structures like the lacrimal system, extraocular muscles, conjunctiva, cornea, sclera, uvea including the iris and ciliary body, lens, aqueous humour, vitreous, and retina. The cornea refracts light and has 5 layers while the sclera is a collagenous outer coat perforated by blood vessels and nerves. The uvea provides nutrients to the retina and the lens focuses light onto the retina.
Eye--- Structu Composition of eye and biochemical events of visual transducti...
This ppt helps to understand students basic concepts of eye with the best diagram, Students preparing for +1,+2, NEET, CSIR-NET can prepare from this ppt
The human eye. group 1
This document summarizes key information about the anatomy and physiology of the human eye. It discusses the main parts of the eye and their functions, including the sclera, choroid, retina, lens, cornea, iris, and extraocular muscles. It also describes the eye's blood supply and innervation, as well as common eye pathologies and vision problems. Imaging modalities for examining the eye, such as x-ray, ultrasound, CT, MRI, are also summarized.
Anatomy Of The Eye
The eyeball has three concentric layers - the outer protective sclera, the middle vascular uvea, and the inner light-sensitive retina. It contains important structures like the cornea, iris, ciliary body, choroid, vitreous humor, and optic nerve. The eye is surrounded by accessory structures including the eyelids, lacrimal apparatus for tear production and drainage, conjunctiva, extraocular muscles to control eye movement, and orbit bone for protection. All of these work together to allow for vision.
ophthalmology-v-eye-anatomy-and-function.pdf
This document summarizes the anatomy and function of the eye. It describes the layers of the eye including the sclera, choroid, and retina. It explains how the cornea and crystalline lens refract light and how accommodation allows the eye to focus on near and far objects. The document also outlines the anatomy and function of the tear film, extraocular muscles, visual pathway, and common eye conditions like cataracts.
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The physiology of human eye
- 1. Presented by: Haider Zaman THE PHYSIOLOGY OF HUMAN EYE
- 2. THE EYE • Eye is the gift of the creator • Eye give us the sense of light • They are pair in numbers • Eye receive light stimulus and transforms It into nerve impulse. which runs along the Optic nerve reaching the visual cortex and gives rise to visual sensation
- 3. EXTERNAL STRUCTURE OF EYE: • Includes bony orbit, eyelids, • eyelashes • Tears • Fat glands • Extra ocular muscle • conjunctiva
- 4. EXTERNAL STRUCTURE OF EYE: • Includes bony orbit: the anatomical space that contains the eye • Eyelids: These cover the orbits interiorly. • Extra ocular muscle: These muscles are separate from the eye. • They are responsible for the movement of • the eyeball and superior eyelid.
- 5. PARTS OF EYE
- 6. PARTS OF EYE: • Aqueous Homour: It is clear watery fluid in the interior chamber Function: Nourishes the lens & cornea Helps refract light onto the retina
- 7. VITREOUS HUMOUR: • A clear, gel like fluid in the posterior chamber • Support the lens & retina and keeps the eye from collapsing.
- 8. RETINA: • Innermost, sensitive layer of the eye • A delicate membrane containing photoreceptor and associated neurons • Transforms light energy to electrical signals • two main kind of photoreceptor (cone & Rods)
- 9. CONE: • Sensitive to bright light • Cluster near the center of retina • Distinguish colours • 5 million cones in the retina
- 10. RODS: Sensitive to dim light 125 million rods in the retina Allow dim light vision Black: consBlack: cons Bright: rodsBright: rods
- 11. LENS: • The lens sits directly behind the pupil. This is a clear layer that focuses the light the pupil takes in. It is held in place by the ciliary muscles, • Function: allow the lens to change shape depending on the amount of light that hits it so it can be properly focused.
- 12. OPTIC DISC: • The point where optic nerve enter to retina Choroid: The choroid lies between the retina and the sclera, Function: provides blood supply to the eye. disk opticdisk optic
- 13. IRIS The iris is the area of the eye that contains the pigment which gives the eye its color. Function: This allows the eye to take in more or less light depending on how bright it is around you.
- 14. OPTIC NERVE • The bundle of over one billion nerve fibers that carry visual message from retina to the brain. • 1.3mm place where • 26billion optic nerves are Passed.
- 15. MECHANISM • Eye • Optic nerve • Lateral Geniculate nucleus • Visual cortex
- 16. RETINAL BLOOD VESSELS: • Arteries transmit oxygen & nutrients • veins carry deoxygenated blood from the eye
- 17. SCLERA • The sclera is commonly referred to as the "whites" of the eye. This is a smooth, white layer on the outside, but the inside is brown • Function • The sclera provides structure and safety for the inner workings of the eye.
- 18. CORNEA • The cornea is the outer covering of the eye. This dome-shaped layer • Function: • protects your eye from elements that could cause damage to the inner parts of the eye.
- 19. PUPIL & CONJUNCTIVA GLANDS • The pupil appears as a black dot in the middle of the eye. • Function: This black area is actually a hole that takes in light so the eye can focus on the objects in front of it. • Conjunctiva Glands: • These are layers of mucus which help keep the outside of the eye moist.