public function getChoices($datatype = null)
{
if ($datatype == null) {
$datatype = $this->datatype;
}
if ($datatype == 'bool') {
return array('0' => 'No', '1' => 'Yes');
} elseif ($datatype == 'va') {
return OphCoTherapyapplication_Helper::getInstance()->getVaListForForm();
}
return;
}