The eye is an intricate part of our body. In comparison to a car‚ the engine being the heart‚ the gas tank being the stomach‚ the eye would be all the windows and gauges. Imagine having all the windows fogged and not being able to see. Imagine the gauges do not work and you do not know how fast you are going or how much gas is left in tank. You would have to drive with feeling only. The image with all the parts are depicted in Figure 1.1. Without the eye you would be in the same sinking boat. The
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identify each lettered structure in the diagram by writing the letter next to its name in the numbered list. a b c 1. anterior chamber 2. anterior segment 3. bipolar neurons f p 4. choroid 5. ciliary body and processes 6. ciliary muscle 7. cornea 8. dura mater 9. fovea centralis 10. ganglion cells 11. iris 12. lens 13. optic disc 14. optic nerve 15. photoreceptors 16. posterior chamber 17. retina e e a j ---~¥.:::++-g h q u o b r k s
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e‚ L. (2016). Human Eye Anatomy - Parts of the Eye Explained. [online] All About Vision.) Lens: The lens is positioned behind the cornea. It has a nearly spherical structure that enables the eye to focus on an object either moving closer to or farther away from you‚ the lens focuses the light rays bouncing of the objects and onto the retina. It’s used to diffract light rays. It can only be damaged by a disease called”cataract”. The cataract causes clouding. lateral rectus muscle: This is one of six
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Middle Choroid Inner Retina Choroid layer: Prevents glare Ciliary Body: Circular Muscle changes the shape of lens Circular Iris: Dilates‚ Constricts Pupil Eyeball Cavities Vitreous Humor: Holds Retina in Place Aqueous Humor: Nourishes Lens/Cornea Retina: Lines Posterior Eyeball Contains Rods (Light) black and white Cones (Color) for Vision Fovea: Most Acute Color VisionOptic Nerve: Transmit Image Color Blind * Retina: Lines Posterior Eyeball‚ Problem with * Cones (Color)
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Cochlear implants replace the function of the damaged parts of the ear. Signals made by the implant are sent directly via the auditory nerve to the brain‚ which recognises the signals commonly known as sound. 6‚ Light rays enter the eye through the cornea. The cornea’s refractive power bends the light waves then they pass through the pupil. The light rays must then pass through the vitreous and come to a sharp converging point on the retina. The retina develops them into light impulses through millions
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Chapter 14 Outline I. Refraction of Light A. Refraction is the bending of light at the boundary of two media. 1. It is caused by differences in the way light travels in the two media a) Light changes speed unequally. (1) One side of the light becomes slower/faster 2. If light is perpendicular to the new medium‚ light will not refract a) If the media have the same index of refraction‚ light will not refract B. Index of Refraction 1. How well light travels through a medium is measured by
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to be dark brown. I know that human’s iris come in different colour such as green‚ blue‚ gray‚ etc. Cornea They look exactly the same Exterior Observations - A diagram illustrating the shape of Cornea‚ Iris and Pupil Description of Cow’s Eyeball’s Shape The two eyeballs (cows and humans) look very similar. The cow’s eyeball seemed to be almost round (excluding the cornea section). The cornea always seemed to be the part that was ’sticking out’ of the eyeball. Function for Muscles The muscles
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donor card. Organs that can be donated are kidneys‚ heart‚ liver‚ lungs‚ and pancreas. Tissues that can be donated are corneas‚ skin‚ bone‚ middle-ear bones‚ bone marrow‚ connective tissues‚ and blood vessels. Donation of a heart‚ liver‚ lungs‚ pancreas‚ or heart/lung can only occur in the case of brain death. The donation of tissues such as bone‚ skin‚ or corneas can occur regardless of age and in almost any cause of death. This of course causes ethical issues because each family has
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two-piece unit. The smaller frontal unit‚ more curved‚ called the cornea is linked to the larger unit called the sclera. The corneal segment is typically about 8 mm (0.3 in) in radius. The sclera constitutes the remaining five-sixths; its radius is typically about 12 mm. The cornea and sclera are connected by a ring called the limbus. The iris – the color of the eye – and its black center‚ the pupil‚ are seen instead of the cornea due to the cornea’s transparency. To see inside the eye‚ an ophthalmoscope is
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MIRROR -The simplest and the most common optical instrument. -Uses the Law of Reflection to redirect light it receives. -It reflects most of the light in one direction. -Good reflecting mirrors can have 85% reflectance. Types of Mirror 1. Plane Mirror A mirror with a flat surface. Image formed: Laterally inverted Upright and always the same size as the object they reflect. Virtual image (images appear to behind the mirror) at the same distance as the object in front of the mirror. Examples:
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