function ClearLensfinderForm()
{
    document.getElementById("ctl00_txtFocalLength1").value = "";
    document.getElementById("ctl00_txtFocalLength2").value = "";
    document.getElementById("ctl00_txtR11").value = "";
    document.getElementById("ctl00_txtR12").value = "";
    document.getElementById("ctl00_txtR21").value = "";
    document.getElementById("ctl00_txtR22").value = "";
    document.getElementById("ctl00_txtThickness1").value = "";
    document.getElementById("ctl00_txtThickness2").value = "";
    document.getElementById("ctl00_txtDiameter1").value = "";
    document.getElementById("ctl00_txtDiameter2").value = "";
    document.getElementById("ctl00_txtIndex1").value = "";
    document.getElementById("ctl00_txtIndex2").value = "";
    document.getElementById("ctl00_txtV1").value = "";
    document.getElementById("ctl00_txtV2").value = "";
}