Value of Two Stacked Prisms-Children's Eye Wiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
====== Value of Two Stacked Prisms ======
**The prisms are pointing in the same direction **
===== Calculator =====
<html>
<head>
    <title>Stacked 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: 16px;
            font-weight: bold;
            color: blue;
            margin-top: 10px;
        }
    </style>
    <script>
        const prismTable = {
            10: {1: 11, 2: 12, 3: 13, 4: 14, 5: 15, 6: 16, 7: 17, 8: 19, 9: 20, 10: 21, 12: 23, 14: 25, 16: 28, 18: 30, 20: 33, 25: 39, 30: 46, 35: 53, 40: 60, 45: 68, 50: 77},
            12: {1: 13, 2: 14, 3: 15, 4: 16, 5: 17, 6: 19, 7: 20, 8: 21, 9: 22, 10: 23, 12: 25, 14: 28, 16: 30, 18: 33, 20: 35, 25: 42, 30: 49, 35: 57, 40: 65, 45: 74, 50: 84}, 
            14: {1: 15, 2: 16, 3: 17, 4: 18, 5: 20, 6: 21, 7: 22, 8: 23, 9: 24, 10: 25, 12: 28, 14: 30, 16: 33, 18: 35, 20: 38, 25: 45, 30: 53, 35: 61, 40: 70, 45: 80, 50: 91}, 
            16: {1: 17, 2: 18, 3: 19, 4: 21, 5: 22, 6: 23, 7: 24, 8: 25, 9: 27, 10: 28, 12: 30, 14: 33, 16: 36, 18: 38, 20: 41, 25: 49, 30: 57, 35: 66, 40: 76, 45: 87, 50: 100}, 
            18: {1: 19, 2: 20, 3: 22, 4: 23, 5: 24, 6: 25, 7: 26, 8: 28, 9: 29, 10: 30, 12: 33, 14: 35, 16: 38, 18: 41, 20: 44, 25: 52, 30: 61, 35: 71, 40: 82, 45: 95, 50: 110},
            20: {1: 21, 2: 23, 3: 24, 4: 25, 5: 26, 6: 27, 7: 29, 8: 30, 9: 31, 10: 33, 12: 35, 14: 38, 16: 41, 18: 44, 20: 47, 25: 56, 30: 66, 35: 76, 40: 89, 45: 104, 50: 122},
            25: {1: 27, 2: 28, 3: 29, 4: 30, 5: 32, 6: 33, 7: 35, 8: 36, 9: 37, 10: 39, 12: 42, 14: 45, 16: 49, 18: 52, 20: 56, 25: 66, 30: 78, 35: 93, 40: 110, 45: 133, 50: 165},
            30: {1: 32, 2: 33, 3: 35, 4: 36, 5: 38, 6: 39, 7: 41, 8: 42, 9: 44, 10: 46, 12: 49, 14: 53, 16: 57, 18: 61, 20: 66, 25: 78, 30: 94, 35: 114, 40: 141, 45: 183, 50: 265},
            35: {1: 37, 2: 39, 3: 40, 4: 42, 5: 44, 6: 45, 7: 47, 8: 49, 9: 51, 10: 53, 12: 57, 14: 61, 16: 66, 18: 71, 20: 76, 25: 93, 30: 114, 35: 144, 40: 195, 45: 315},
            40: {1: 43, 2: 45, 3: 46, 4: 48, 5: 50, 6: 52, 7: 54, 8: 56, 9: 58, 10: 60, 12: 65, 14: 70, 16: 76, 18: 82, 20: 89, 25: 110, 30: 141, 35: 195, 40: 339},
            45: {1: 48, 2: 50, 3: 52, 4: 54, 5: 56, 6: 59, 7: 61, 8: 63, 9: 66, 10: 68, 12: 74, 14: 80, 16: 87, 18: 95, 20: 104, 25: 133, 30: 183, 35: 315},
            50: {1: 54, 2: 56, 3: 58, 4: 61, 5: 63, 6: 66, 7: 68, 8: 71, 9: 74, 10: 77, 12: 84, 14: 91, 16: 100, 18: 110, 20: 122, 25: 165, 30: 265}

        };

        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 Two Prisms Stacked in the Same Direction</h2>
    <label>Select Initial Prism (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>
    <label for="prism1">Select Prism Stacked On Top (PD): </label>
    <br>
    <input type="radio" name="prism1" value="1"> 1
    <input type="radio" name="prism1" value="2"> 2
    <input type="radio" name="prism1" value="3"> 3
    <input type="radio" name="prism1" value="4"> 4
    <input type="radio" name="prism1" value="5"> 5
    <input type="radio" name="prism1" value="6"> 6
    <input type="radio" name="prism1" value="7"> 7
    <input type="radio" name="prism1" value="8"> 8
    <input type="radio" name="prism1" value="9"> 9
    <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>

    <button onclick="lookupValue()">Lookup</button>
    <br>
    <br>
    <p id="result"></p>
</body>
</html>

<button type="primary" size="sm">[[prism_stacking|Reset Calculator]]</button>

==== Table ====


|                |  **1st Prism**                                          |||||
| **2nd Prism**  | **10Δ**         | **20Δ**  | **30Δ**  | **40Δ**  | **50Δ**  |
| **10Δ**        | 21              | 33       | 46       | 60       | 77       |
| **20Δ**        | 33              | 47       | 66       | 89       | 122      |
| **30Δ**        | 46              | 66       | 94       | 141      | 264      |
| **40Δ**        | 60              | 89       | 141      | 339      |          |
| **50Δ**        | 77              | 122      | 256      |          |          |

<pane id="reference">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