Ophthalmology: Optic Testing

Descripción

Math assignment
Charizma Laughton
Mapa Mental por Charizma Laughton, actualizado hace más de 1 año
Charizma Laughton
Creado por Charizma Laughton hace más de 8 años
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Resumen del Recurso

Ophthalmology: Optic Testing
  1. Number
    1. Rational Number
      1. Precise measurements in units such as millimetres
        1. In the fraction 20/20 - the numerator is the distance in feet between the subject and the eye chart. The denominator is the distance frm which a normal person can read the 8th line - 1 arc minute
        2. Whole Number
          1. Eye measurements are usually in millimetres (mm)
          2. Geometry
            1. Circles & Domes
              1. Pupil
                1. Iris
                2. Sphere
                  1. Shape of an eyeball
                3. Measurement
                  1. Angles
                    1. Angles of light reflection in the eye
                      1. 1 minute of arc (1 minute is 1/60 of a degree)
                      2. Diameter
                        1. Measuring the cross distance of certain circular shapes in the eye such as the iris
                        2. Radius
                          1. Circumference
                            1. Determining dilation/constriction of the pupil
                            2. They use trigonometry to determine the height of letters in an eye testing chart
                            3. Placing an eye chart on a wall involves specific mathematic measurements such as angle of where a letter is in relation to a person's eye and distance of chart from the viewer
                              1. The minimum average separation of two lines (depicted in a letter) that a person can see is an angle of 1 minute arc
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