Optic Nerve Diameter Calculator

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<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Calculate Optic Nerve Diameter</title>

</head> <body>

<h3>Calculate optic nerve diameter Using Heidelberg Spectralis OCT optic nerve report</h3>

<label for="a">Measure green ring diameter from OCT report and enter here (mm):</label>
<input type="number" id="a" step="any" placeholder="Ring Diameter"><br><br>

<label for="b">Measure optic nerve diameter from OCT report and enter here (mm):</label>
<input type="number" id="b" step="any" placeholder="Optic Nerve Diameter"><br><br>

<button onclick="calculateC()">Calculate</button>
<br><br>
<p id="result"></p>

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

    // Check if inputs are valid numbers
    if (isNaN(a) || isNaN(b) || a === 0) {
      document.getElementById("result").textContent = "Please enter valid numbers. They must not be zero.";
      return;
    }

    // Calculate C using the formula
    const c = (b / a) * 3.5;

    // Display the result in bold
    document.getElementById("result").innerHTML = `The optic nerve diameter is: <strong>${c.toFixed(2)} mm</strong>`;
  }
</script>

</body> </html>

Test Procedure

Use this test to estimate the optic nerve diameter (in whichever direction) of the Heidelberg Spectralis optic nerve report. This report must show an image of the optic nerve head and the green peripapillary ring