Retinoblastoma is an eye cancer that starts in the retina‚ the sensitive lining on the inside of an eye. The disease most commonly affects young children‚ but can occasionally occur in older adults. Retinoblastoma may occur in either one or both eyes. The retina is made up of nerve tissue that senses light as it comes through the front of the eyes. Then the retina sends signals through the optic nerve to the brain‚ where these signals are intercepted as images. The symptoms of retinoblastoma include
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What Causes Optical Illusions? Optical illusions are how the eye sees the illusion. Most people now believe that seeing optical illusions has to do with perspective‚ or the way you look at something. The concept of optical illusion was first used by the Greeks. They built their temples so that the roof was slanted. This gave the illusion that the temple was actually standing straight. We get used to how things are supposed to be‚ and sometimes our brain gets the wrong message. Our brain puts
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spinal cord injury and stroke. In Retinal diseases‚ scientists and researchers have been able to direct the growth of photoreceptor cells from stem cells. A healthy retina is crucial for good vision. The retina is a layer of nerve tissue in the back of your eye that senses light and sends images to your brain. In the center of the retina is what is known as the macula. The macula provides sharp vision for things such as driving‚ reading and seeing in fine detail‚ Retinal disorders can cause damage
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ATTENTION GETTER: A 15 yr old boy was in biology class when his teacher was talking about people with colorblindness. The class laughed as they all called out the numbers they saw from a sheet that the teacher was holding up. The young boy was doing the same thing until all of a sudden he didn’t see one of the numbers and raised his hand. He told everyone that he couldn’t see the number as he sat in amazement. The young boy had no idea he was colorblind until that day. REASONS FOR LISTENING:
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Abstract Bionics is a field‚ which combines both electronics and biology. In simple terms‚ when we think about bionics‚ it is generally more about prosthetic arms or leg enhancement worn outside the body and‚ to some extend‚ even implanted sensor devices inside the body‚ which are essentially enhanced to carry out certain routine tasks. These are essentially life systems that are powered by motors/actuators and sensory arrays. These send neural signals from affected part of the body to the brain
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8th physics light reflection refraction eyes defect and dispersion The ray of light which falls on the mirror surface is called incident ray. The point at which the incident ray strikes the mirror is called the point of incidence. The ray of light which is sent back by the mirror is called the reflected ray. The ‘normal’ is a line drawn at right angles to the mirror surface at the point of incidence. The angle between incident ray and normal is called the angle of incidence. The angle between
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must come to a point on the retina. Light rays do not normally travel toward each other‚ usually the light rays either travel outwards or almost parallel‚ for this reason the light rays must be refracted. The cornea is the primary place of refraction‚ the "bent" light rays then travel through the aqueous humor and the pupil to the lens. Here the light is one again refracted even closer together‚ the light then goes through the vitreous humor and is projected onto the retina. The focus of the lens should
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Rather 80 percent of of those fibers come from deep within the brain itself.” This statement is surprising and points out that our perception is not the result of the brain’s interpretation of the messages coming from the retina. “A human brain has inputs and outputs. The inputs are signals from the person’s eyes and ears and other sense organs.” This statement conflicts with his claim that perception is a brain-dependent process. It suggests that the perception of reality
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Vision and Perception 1. Vision and Perception a. Define sensation and perception. How are these related? How are they distinct? b. Briefly describe the visual system and how visual sensation becomes perception. c. What are microsaccades? What do they do and how do they work? d. How can abnormal microsaccades affect individuals’ health and functioning? e. Conde & Macknik (2011) Shifting focus; Myers (2011) Module 14 Vision and Perception
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Propagation‚ Diabetic Retina‚ Level set segmentation 1. INTRODUCTION A diabetic retinopathy is the most common diabetic eye disease which leads to the blindness because of the changes in the blood vessels of the retina. In this disease‚ blood vessels may swell‚ leak fluid and abnormal new growth on the surface of the retina. The retina is the light-sensitive tissue at the back of the eye. A healthy retina is necessary for good vision. Figure 1 shows the diabetic retina with swollen nerves
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