This calculator helps you estimate the annual cost of Acuvue multifocal contact lenses based on your prescription and purchase habits. Understanding the potential cost can help you budget effectively for your eye care needs.
function calculateAcuvueCost() {
var leftEyeSphere = parseFloat(document.getElementById("leftEyeSphere").value);
var leftEyeAdd = parseFloat(document.getElementById("leftEyeAdd").value);
var rightEyeSphere = parseFloat(document.getElementById("rightEyeSphere").value);
var rightEyeAdd = parseFloat(document.getElementById("rightEyeAdd").value);
var boxPrice = parseFloat(document.getElementById("boxPrice").value);
var replacementFrequency = parseInt(document.getElementById("replacementFrequency").value);
var resultDiv = document.getElementById("result");
resultDiv.innerHTML = ""; // Clear previous results
// Validate inputs
if (isNaN(leftEyeSphere) || isNaN(leftEyeAdd) || isNaN(rightEyeSphere) || isNaN(rightEyeAdd) || isNaN(boxPrice) || isNaN(replacementFrequency) || boxPrice <= 0 || replacementFrequency <= 0) {
resultDiv.innerHTML = "Please enter valid positive numbers for all fields.";
return;
}
// Determine if multifocal lenses are needed for each eye based on ADD power
var needsMultifocalLeft = !isNaN(leftEyeAdd) && leftEyeAdd !== 0;
var needsMultifocalRight = !isNaN(rightEyeAdd) && rightEyeAdd !== 0;
// Acuvue multifocal lenses are typically sold in boxes of 6.
// Each eye typically uses 1 lens every replacement cycle.
// So, 2 lenses are used per replacement cycle for both eyes.
var lensesPerYear = 12 / replacementFrequency * 2; // 2 lenses per cycle * cycles per year
// We assume that if multifocal is needed for an eye, that specific multifocal lens is used.
// For simplicity, we are not differentiating between different types of multifocal lenses based on ADD power.
// The core calculation is how many lenses are needed per year and their cost.
var totalBoxesNeeded = Math.ceil(lensesPerYear / 6);
var annualCost = totalBoxesNeeded * boxPrice;
resultDiv.innerHTML = "Estimated Annual Acuvue Multifocal Lens Cost: $" + annualCost.toFixed(2) + "";
resultDiv.innerHTML += "You will need approximately " + lensesPerYear.toFixed(0) + " lenses per year.";
resultDiv.innerHTML += "This equates to about " + totalBoxesNeeded + " boxes of 6 lenses.";
}
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padding: 20px;
border-radius: 8px;
max-width: 500px;
margin: 20px auto;
background-color: #f9f9f9;
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.calculator-container h2 {
text-align: center;
color: #333;
margin-bottom: 15px;
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transition: background-color 0.3s ease;
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.calculator-container button:hover {
background-color: #0056b3;
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#result {
margin-top: 25px;
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#result strong {
color: #28a745;
}