ANATOMY & PHYSIOLOGY of the EYE Even though the eye is small‚ only about 1 inch in diameter‚ it serves a very important function -- the sense of sight. 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
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Case Report Clinical Assessment of a Patient With Compound Myopic Astigmatism and Convergence Insufficiency Abstract Myopic astigmatism is a specific type of astigmatism wherein the light focuses before it reaches the retina. This condition is classified as a combination of astigmatism and myopia‚ or nearsightedness. If both principal meridians are nearsighted‚ but one is more pronounced than the other‚ it is considered to be a compound myopic astigmatism. Convergence Insufficiency on
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surprise our teacher told us that we would have the opportunity to go to laser tag if we all scored over a 75% on our final exam. Our teacher claimed that laser tag was going to be a great educational outing‚ and justified it by discussing the refraction of light‚ and how the laser of the gun passes through two different mediums. However‚ the only thing we got from this conversation was that we were going on a field trip‚ and playing laser tag. It was the day before the trip and we were all
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also ask if any medication is being taken at that time. After this a visual acuity is performed using a smellen chart. The individual will be asked to read random letters displayed on a video projector. To test if an individual needs glasses the refraction test is performed‚ flipping different lenses amongst the eyes asking which appears better. Peripheral vision is checked and pupils are looked at with pen- lights. Often eye drops are used to dilate the pupils‚ allowing the doctor to view the back
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prefered to seek out purely mechanical explanation. He agreed with the fact that light is a pulse phenomena‚ but denies strongly that they have periodicity. He developed the concept wave front‚ driving the laws of his pulse theory‚ discovering double refraction. Chemistry originally derived from philosophy‚ alchemy‚ medicine‚ and metallurgy‚ only arriving as its own separate science in the 17th century. Transmutable each into the other‚ all four
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A force can do one of four things to an object: 1. Make it speed up - accelerate. 2. Make it slow down - decelerate. 3. Change its direction. 4. Change its shape. If something is doing one of these four things there must be net force acting upon it. Newton’s First Law ’Every body continues in a state of rest or uniform motion unless acted upon by an external force.’ Something without net force acting on it will either stay still or move at a constant speed in a straight line until
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A ground breaking new tool used to study the heavens was introduced in the 17th century. This tool was known as the telescope. It revealed the cosmos in a different way than our naked eye could ever perceive. The telescope opened doors to countless stars‚ nebulae‚ galaxies‚ and a slew of never before seen wonders. With its creation came limitations and caused the need to improve and upgrade the methods in which the telescope functioned and find new ways of viewing the heavens.There are three main
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Alhazen Ibn al-Haytham‚ born 965ce – 1039ce an Arab /Persian scientist and polymath‚ also significant contributions to the principals of optics‚ as well as to physics‚ anatomy‚ astronomy‚ engineering‚ mathematics‚ medicine‚ ophthalmology‚ philosophy‚ psychology‚ visual perception‚ and to science in general with his early application of the scientific method. After being ordered by Al-Hakim bi-Amr Allah‚ the sixth ruler of the Fatimid Caliphate‚ to carry out this operation‚ he quickly perceived the
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Reflection seismic data along Orsa profile was acquired in 2011 (Fig. 2) by Juhlin et al. (2012). The length of the profile was 12 km directed by NE-SW direction. The acquisition line is crooked for the purpose of the facility. and followed roads and forest due to crooked line. The general acquisition parameters list in Table 1. Table 1 list the data acquisition along the profile. The VIBSIST 3000 was used as a source to generate the seismic signal with 542 points and 20 m source spacing. The spread
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Although global temperatures fluctuate naturally‚ over the past 50 years the average global temperature has augmented at its fastest rate in recorded history. The emission of greenhouse gasses such as Carbon Dioxide (CO2)‚ Nitrous Oxide (N2O) and Methane (CH4) render the Earth’s atmosphere more transparent to visible radiation from the sun than to infrared radiation emitted and reflected from the planet’s surface (NASA Earth Observatory). With this extra heat trapped within the atmosphere‚ the temperature
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