Optic Disc Area Calculator-Children's Eye Wiki

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====== Optic Disc Area Calculator ======

<button type="primary" size="sm">[[optic_disc_area_calculator|Reload Calculator]]</button>

<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Calculate D</title>
</head>
<body>
  <h3>Estimate Disc Area from the Heidelberg Spectralis OCT optic nerve report</h3>

  <form id="calc-form">
    <label for="a">Measure ring diameter (mm):</label>
    <input type="number" id="a" step="any" placeholder="Enter Ring Diameter" required><br><br>

    <label for="b">Measure horizontal disc diameter (mm):</label>
    <input type="number" id="b" step="any" placeholder="Enter Horizontal Disc Diameter" required><br><br>

    <label for="c">Measure vertical disc diameter:</label>
    <input type="number" id="c" step="any" placeholder="Enter Vertical Disc Diameter" required><br><br>

    <button type="button" onclick="calculateD()">Calculate</button>
  </form>
  <br><br>
  <p id="result"></p>

  <script>
    function calculateD() {
      // Get input values
      const a = parseFloat(document.getElementById("a").value);
      const b = parseFloat(document.getElementById("b").value);
      const c = parseFloat(document.getElementById("c").value);

      // Check for valid input and ensure A is not zero
      if (isNaN(a) || isNaN(b) || isNaN(c) || a === 0) {
        document.getElementById("result").textContent = "Please enter valid numbers for ring diameter, horizontal and vertical disc diameters. Values must not be zero.";
        return;
      }

      // Calculate D using the formula D = π * (3.0625 * B * C) / (A^2)
      const d = Math.PI * (3.0625 * b * c) / (a * a);

      // Display the result in bold
      document.getElementById("result").innerHTML = `The estimated disc area is: <strong>${d.toFixed(2)} mm2</strong>`;
    }
  </script>
</body>
</html>

----
=== Test Procedure ===
<wrap hi>1. Obtain the Heidelberg Spectralis optic nerve report.  The report must show an image of the optic nerve head and the superimposed peripapillary ring where peripapillary segmentation was performed.<wrap>\\

{{::spectralis_oct_optic_nerve_report.png?|}}\\
<wrap hi>2. Measure ring diameter</wrap>
{{::spectralis_measure_ring.png?600|}}\\
<wrap hi>3. Measure horizontal optic nerve diameter</wrap>
{{::spectralis_horizontal_disc.png?600|}}\\
<wrap hi>4. Measure vertical optic nerve diameter</wrap>
{{::spectralis_vertical_disc.png?600|}}

<WRAP round tip 60%>
See [[optic_disc_area|Normative Data for Optic Disc Area]]
</WRAP>


{{tag>calculator optic_disc}}
calculator optic disc