simultaneously on a single point. A congenital cataract is where the lens of the eye is cloudy. A retinopathy of prematurity which may occur in premature babies when the light-sensitive retina hasn’t developed sufficiently before birth. A Retinitis Pigmentosa is a rare inherited disease that slowly destroys the retina. Coloboma is where a portion of the structure of the eye is missing. optic nerve hypoplasia which is caused by underdeveloped fibers in the optic nerve and which affects depth perception
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PSC 101 EXAM 2 Study Guide Part 1- Sensory Systems 1. Sound can best be thought of as a) compression of air molecules by an object. b) changes in air pressure produced by the vibration of an object. c) particles of energy that travel at better than 20 miles per hour. d) packets of energy. e) expansion of air molecules produced by an object as it moves through air. 2. The loudness of a sound is related to a) the amplitude of sound vibration. b) the distance between the successive
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According to North Bay Eye Associates there are 4% of all children in the United States have strabismus. It occurs equally in males and females. Strabismus or crossed eye can be described as the condition where the eyes unable to corporate when the person are trying to focus on something. Someone can be categorized as a cross eye’s patient is when their eyes moves in different way and look at the cross point. It occurs when an eye turns in‚ out‚ up or down and is usually caused by poor eye muscle
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1. Sensation There are different modalities (forms) of sensation Sound‚ pain‚ pressure‚ touch‚ stretch‚ vibration‚ heat‚ cold‚ vision‚ taste‚ smell‚ proprioreception‚ hearing‚ equilibrium‚ gustation‚ etc. Each modality has a specific receptor Each modality is conducted by sensory (afferent) neurons to the CNS and is the result of different neural pathways and synaptic connections 2. Sensory Pathways 3. Law of Specific Nerve Energy Each sensory neuron carries information about
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Human visual hardware is a result of a billion years of evolution within the earths atmosphere where light is scattered by molecules of air‚ moisture‚ particular matter etc. However as we ascend into our atmosphere with decrease density‚ light distribution is changed resulting in our visual hardware receiving visual data in different format. Some Aspects to Consider: 1. Visual acuity is the degree to which the details and contours of objects are perceived. Visual acuity
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Comparing the Usefulness of the Non-Mydriatic Fundus Camera to the Direct Ophthalmoscope for Medical Education Summary Since fundus examination is essential for some cases to evaluate the health of the eye. Ophthalmoscope is a basic instrument for examining the fundus. However‚ it has many clinical and educational restrictions. Therefore‚ invention of non-mydriatic automatic fundus camera could benefit clinical practice as well as educational purposes. In this study I focus the light on the ability
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implants for extended drug delivery: therapeutic applications. Adv Drug Deliv Rev 58‚ 1182-1202. Bourges‚ J. L.‚ Gautier‚ S. E.‚ Delie‚ F.‚ Bejjani‚ R. A.‚ Jeanny‚ J.‚ Gurny‚ R.‚ BenEzra‚ D.‚ and Behar-Cohen‚ F. (2003). Ocular drug delivery targeting the retina and retinal pigment epithelium using polylactide nanoparticles. Invest Opth Vis Sci 44‚ 3562-9. Clark‚ A. F‚ and Yorio‚ T. (2003). Ophthalmic drug discovery. Nature Rev 2‚ 448-59. Davis‚ J. L.‚ Gilger‚ B. C.‚ and Robinson‚ M. R. (2004). Novel approaches
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the colored part of the eye. The cornea covers the iris and the pupil‚ which are in front of the lens. The pupil is the small‚ round‚ black-appearing opening in the center of the iris. Light passes through the pupil‚ on through the lens‚ and to the retina at the back of the eye. This diagram shows the drainage angle of the eye. The front part of the eye is in cross section to show the filtering‚ or drainage‚ angle. This angle is between the cornea and the iris‚ which join each other right where the
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Sensation 2. _________Absolute Threshold____ refers to the smallest change in sensation that can be detected at least 50% of the time. a. Adaptation b. Weber’s Law c. Difference Threshold d. Absolute Threshold 3. Sensory cells located on the retina that receive incoming visual stimuli are _____Ganglion Cells ______. a. Rods and Cones b. Fovea c. Ganglion Cells d. Blind Spot 4. The principles of similarity‚ proximity‚ continuity‚ and closure are examples of _______Laws of perceptual
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sensation. As we sense the world or react to particular stimuli ‚ our brains receive that visual information and transform it into neural impulses called transduction. Our eyes‚ a light-capturing organ‚ consists of many parts that aid in our vision. The retina‚ specifically the eye’s light-sensitive surface on which the light rays are focused‚ contain rods and cones. These cells enable color and are sensitive to light (cones) and enable black and white in darkness as well (rods). Perception begins with
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