function open_result(){
  window.open("result.html","result","width=640 height=550");
}

document.write('<form name="frm" class="calc-input">');
document.write('<div class="calc-header">視力測定</div>');
document.write('<div class="calc-button">');
document.write('<input type="button" value="測定開始" size="12" onclick="open_result();" />');
document.write('</div>');
document.write('</form>');