snellen chart definition
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Definitions &Translations Freebase(0.00 / 0 votes)Rate this definition: Snellen chart. A Snellen chart is an eye chart used by eye care professionals and others to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862. Vision scientists now use a variation of this chart, designed by Ian Bailey and Jan Lovie.
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Visual acuity That size is specified as a visual angle, which is the angle, at the eye, under which the optotype appears. For 6/6 = 1.0 acuity, the size of a letter on the Snellen chart or Landolt C chart is a visual angle of 5 arc minutes (1 arc min = 1/60 of a degree). By the design of a typical optotype (like a Snellen E or a Landolt C), the critical gap that needs to be resolved is 1/5 this value, i.e., 1 arc min.
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Chart A chart, also called a graph, is a graphical representation of data, in which the data is represented by symbols, such as bars in a bar chart, lines in a line chart, or slices in a pie chart . A chart can represent tabular numeric data, functions or some kinds of qualitative structure and provides different info. Maps that are adorned with extra information (map surround) for a specific purpose are often known as charts, such as a nautical chart or aeronautical chart, typically spread over several map sheets.
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scatter diagram Also found in: Dictionary, Encyclopedia, Wikipedia. a graphical figure in which two axes are plotted at right angles to each other, the independent variable on the x (horizontal) axis and the dependent variable on the y (vertical) axis.
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Scatter Plots Scatter Plot (also called scatter diagram) is used to investigate the possible relationship between two variables that both relate to the same event. A straight line of best fit (using the least squares method) is often included.
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Scatterplot and Correlation: Definition, Example & Analysis A scatterplot is a graph that is used to plot the data points for two variables. Each scatterplot has a horizontal axis (x-axis) and a vertical axis (y-axis). One variable is plotted on each axis.
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Snellen Eye Test Charts Interpretation On a Snellen chart we determine the line that the person can just recognize. If that line is twice as large as the reference standard (20/20), we state that that person’s MAgnification Requirement (MAR) is 2x. If the MAgnification Requirement is 2x, the visual acuity is 1/2 (20/40).
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- Accommodation in mild traumatic brain injury. Testing of visual acuity using the Snellen Chart (the standard eye chart used by eye care professionals to measure visual acuity) showed a significant improvement from baseline 14/20 to 17/20 after two months of treatment with Pycnogenol.
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- Synoptic Scale Forecasting: A Primer. Weather Scales. The American Meteorology Society (AMS) defines a synoptic chart as any chart or map on which data and analysis are presented that describe the state of the atmosphere over a large area at a given moment in time.
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scatter plot A scatter plot is a set of points plotted on a horizontal and vertical axes. Scatter plots are important in statistics because they can show the extent of correlation, if any, between the values of observed quantities or phenomena (called variables).
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What is the difference between a 6/6, 6/9, etc., eye vision? Eye vision has two components to it, distant vision and near vision.. Distant vision is checked by using a Snellen's chart while near vision is checked by Jaeger's chart.. What you're asking about is how to understand a Snellen's chart.. A snellen's chart has alphabets in reducing sizes from 64 to 3, but usually its enough to read till the line just above that..
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Snellen chart A wall chart developed by a Dutch ophthalmologist Hermann Snellen in the 19th century, which is still used today to measure visual acuity. It consists of 11 lines of block letters of decreasing size, which are to be read at a distance of 6 metres (20 feet).
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chartnoun  [ C] uk â / tÊÉËt / us â/ tÊÉËrt / chart noun [ C ] (DRAWING) B2 a drawing that shows information in a simple way, often using lines and curves to show amounts: There is a chart on the classroom wall showing the relative heights of all the children. The sales chart shows a distinct decline in the past few months. the TV weather chart.
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Functional Assessment of Vision Recording Snellen Results. 1  Results are recorded as a fraction. 2  Top number equates to the distance (in metres) at which the test chart was presented (usually 6m),  Bottom number identifies the position on the chart of the smallest line read by the 'patient'.
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What is a synoptic chart? What is a synoptic chart? a. A chart that maps the path of a storm c. A chart that maps the...
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- The head and shoulders is a reversal stock chart pattern that can be used to identify the end of a current trend. The head and shoulders is a reversal stock chart pattern that can be used to identify the end of a current trend.
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Snellen chart Snellen chart. A Snellen chart is an eye chart that can be used to measure visual acuity. Snellen charts are named after the Dutch ophthalmologist Herman Snellen who developed the chart in 1862. Many ophthalmologists and vision scientists now use an improved chart known as the LogMAR chart.
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A Practical Guide to Clinical Medicine The Eye Exam. Assessment of Visual Acuity: The first part of the eye exam is an assessment of acuity. This can be done with either a standard Snellen hanging wall chart read with the patient standing at a distance of 20 feet or a specially designed pocket card (held at 14 inches).
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Snellen Family History Click on a circle in the chart to view Snellen immigration records. You can find out when most of the Snellen families immigrated to the United States. You can focus your search to immigration records dating from that era. Immigration records can tell you an ancestor's name, ship name, port of departure, port of arrival and destination.
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Visual Acuity With the standard Snellen chart, your visual acuity will be tested at a distance of 20 feet or 6 meters. If you have vision equivalent to that of the normal average person, then your vision is 20/20 or 6/6.
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- As a result of the. geometric Brownian motion the stock prices follow a log-normal distribution, instead of a. normal distribution as assumed by Bachelier (1900). Sprenkle (1961; 1964) took into account. risk aversion and the drift of the Brownian motion, and based upon the log-normal distribution of.
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Snellen chart Snellen defined standard vision as the ability to recognise a letter (“optotype”) when it forms an angle of 5 arcminutes, which is “line nine” of the letters (“optotypes”) on the chart at 6 metres. Hermann, Dutch ophthalmologist, 1834-1908.
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Chart A chart, also called a graph, is a graphical representation of data, in which the data is represented by symbols, such as bars in a bar chart, lines in a line chart, or slices in a pie chart. A chart can represent tabular numeric data, functions or some kinds of qualitative structure and provides different info.
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snellen chart snellen chart in Medicine Expand. Snellen chart Snel·len chart (sněl'ən) n. A chart for testing visual acuity, usually consisting of letters, numbers, or pictures printed in lines of decreasing size which a patient is asked to read or identify at a fixed distance.
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- A scatter plot is a graph made by plotting ordered pairs in a coordinate plane to show the correlation between two sets of data. 1  A scatter plot describes a positive trend if, as one set of values increases, the other set tends to increase.  A scatter plot describes a negative trend if, as one set of values increases, the other set tends to decrease.
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abscissa abscissa. the horizontal line in a graph along which are plotted the units of one of the variables considered in the study, as time in a time-temperature study. The other line is called the ordinate. Axes of graph showing normal distribution curve.