Value of Two Horizontal Prisms-Children's Eye Wiki

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====== Value of Two Horizontal Prisms====== 
**One prism held over either eye**

  * Prisms are assumed to be in the opposite directions over each eye (e.g. both base in or base out)
  * Prisms are in the <html> <a href="https://childrenseye.org/wiki/lib/exe/fetch.php?cache=&media=frontal_plane_position.png"><em>frontal plane</em> position</a></html>
===== Calculator =====
<html>
<head>
    <title>Horizontal Prism Value Lookup</title>
    <style>
        #header {
            display: none; 
        }
        body {
            font-family: Arial, sans-serif;
            margin: 20px;
            padding: 20px;
        }
        h2 {
            color: #333;
        }
        label {
            font-weight: bold;
        }
        input, button {
            margin-top: 5px;
            padding: 8px;
            font-size: 16px;
        }
        p {
            font-size: 18px;
            font-weight: bold;
            color: blue;
            margin-top: 10px;
        }
    </style>
    <script>
        const prismTable = {
            10: {10: 20, 12: 22, 14: 24, 16: 26, 18: 29, 20: 31, 25: 36, 30: 41, 35: 47, 40: 52, 45: 58, 50: 63},
            12: {10: 22, 12: 24, 14: 26, 16: 29, 18: 31, 20: 33, 25: 38, 30: 44, 35: 49, 40: 55, 45: 60, 50: 66},
            14: {10: 24, 12: 26, 14: 29, 16: 31, 18: 33, 20: 35, 25: 40, 30: 46, 35: 52, 40: 57, 45: 63, 50: 69},
            16: {10: 26, 12: 29, 14: 31, 16: 33, 18: 35, 20: 37, 25: 43, 30: 48, 35: 54, 40: 60, 45: 66, 50: 72}, 
            18: {10: 29, 12: 31, 14: 33, 16: 35, 18: 37, 20: 39, 25: 45, 30: 51, 35: 57, 40: 63, 45: 69, 50: 75},
            20: {10: 31, 12: 33, 14: 35, 16: 37, 18: 39, 20: 42, 25: 47, 30: 53, 35: 59, 40: 65, 45: 71, 50: 78},
            25: {10: 36, 12: 38, 14: 40, 16: 43, 18: 45, 20: 47, 25: 53, 30: 59, 35: 66, 40: 72, 45: 79, 50: 86},
            30: {10: 41, 12: 44, 14: 46, 16: 48, 18: 51, 20: 53, 25: 59, 30: 66, 35: 73, 40: 80, 45: 87, 50: 94},
            35: {10: 47, 12: 49, 14: 52, 16: 54, 18: 57, 20: 59, 25: 66, 30: 73, 35: 80, 40: 87, 45: 95, 50: 103},
            40: {10: 52, 12: 55, 14: 57, 16: 60, 18: 63, 20: 65, 25: 72, 30: 80, 35: 87, 40: 95, 45: 104, 50: 113},
            45: {10: 58, 12: 60, 14: 63, 16: 66, 18: 69, 20: 71, 25: 79, 30: 87, 35: 95, 40: 104, 45: 113, 50: 123},
            50: {10: 63, 12: 66, 14: 69, 16: 72, 18: 75, 20: 78, 25: 86, 30: 94, 35: 103, 40: 113, 45: 123, 50: 133}
        };

        function lookupValue() {
            let prism1 = document.querySelector('input[name="prism1"]:checked').value;
            let prism2 = document.querySelector('input[name="prism2"]:checked').value;
            
            prism1 = parseInt(prism1);
            prism2 = parseInt(prism2);
            
            if (prismTable[prism2] && prismTable[prism2][prism1] !== undefined) {
                document.getElementById("result").innerHTML = `Result: <strong>${prismTable[prism2][prism1]} Prism Diopters</strong>`;
            } else {
                document.getElementById("result").innerText = "Invalid input";
            }
        }
    </script>
</head>
<body>
    <h2 id="header">Prism Value of One Horizontal Prism Held Over Each Eye</h2>
    <label for="prism1">Select Prism 1 (PD): </label>
    <br>
    <input type="radio" name="prism1" value="10"> 10
    <input type="radio" name="prism1" value="12"> 12
    <input type="radio" name="prism1" value="14"> 14
    <input type="radio" name="prism1" value="16"> 16
    <input type="radio" name="prism1" value="18"> 18
    <input type="radio" name="prism1" value="20"> 20
    <input type="radio" name="prism1" value="25"> 25
    <input type="radio" name="prism1" value="30"> 30
    <input type="radio" name="prism1" value="35"> 35
    <input type="radio" name="prism1" value="40"> 40
    <input type="radio" name="prism1" value="45"> 45
    <input type="radio" name="prism1" value="50"> 50
    <br><br>
    <label>Select Prism 2 (PD):</label>
    <br>
    <input type="radio" name="prism2" value="10"> 10
    <input type="radio" name="prism2" value="12"> 12
    <input type="radio" name="prism2" value="14"> 14
    <input type="radio" name="prism2" value="16"> 16
    <input type="radio" name="prism2" value="18"> 18
    <input type="radio" name="prism2" value="20"> 20
    <input type="radio" name="prism2" value="25"> 25
    <input type="radio" name="prism2" value="30"> 30
    <input type="radio" name="prism2" value="35"> 35
    <input type="radio" name="prism2" value="40"> 40
    <input type="radio" name="prism2" value="45"> 45
    <input type="radio" name="prism2" value="50"> 50
    <br><br>
    <button onclick="lookupValue()">Lookup</button>
    <br>
    <br>
    <p id="result"></p>
</body>
</html>

<button type="primary" size="sm">[[actual_value_of_two_prisms_held_over_either_eye|Reset Calculator]]</button>
----
===== Table =====
^ Prism Value  ^ 10 ^ 12 ^ 14 ^ 16 ^ 18 ^ 20 ^ 25 ^ 30 ^ 35 ^ 40 ^ 45 ^ 50 ^
^ 10           | 20 | 22 | 24 | 26 | 29 | 31 | 36 | 41 | 47 | 52 | 58 | 63 | 
^ 12           | 22 | 24 | 26 | 29 | 31 | 33 | 38 | 44 | 49 | 55 | 60 | 66 | 
^ 14           | 24 | 26 | 29 | 31 | 33 | 35 | 40 | 46 | 52 | 57 | 63 | 69 |
^ 16           | 26 | 29 | 31 | 33 | 35 | 37 | 43 | 48 | 54 | 60 | 66 | 72 |
^ 18           | 29 | 31 | 33 | 35 | 37 | 39 | 45 | 51 | 57 | 63 | 69 | 75 |
^ 20           | 31 | 33 | 35 | 37 | 39 | 42 | 47 | 53 | 59 | 65 | 71 | 78 |
^ 25           | 36 | 38 | 40 | 43 | 45 | 47  | 53  | 59  | 66   | 72   | 79   | 86   |
^ 30           | 41 | 44 | 46 | 48 | 51 | 53  | 59  | 66  | 73   | 80   | 87   | 94   |
^ 35           | 47 | 49 | 52 | 54 | 57 | 59  | 66  | 73  | 80   | 87   | 95   | 103  |
^ 40           | 52 | 55 | 57 | 60 | 63 | 65  | 72  | 80  | 87   | 95   | 104  | 113  |
^ 45           | 58 | 60 | 63 | 66 | 69 | 71  | 79  | 87  | 95   | 104  | 113  | 123  |
^ 50           | 63 | 66 | 69 | 72 | 75 | 78  | 86  | 94  | 103  | 113  | 123  | 133  |

<pane id="references">Adapted From: {{::ophthalmic_prisms_measurement_errors_guyton_1983.pdf |Thompson & Guyton. Ophthalmic Prisms: Measurement Errors and How to Minimize Them. Ophthalmology 1983;90:204-2010}}</pane>

{{tag>strabismus prism calculator}}
strabismus prism calculator