public function run()
{
$va_unit_id = @$_GET[$this->va_unit_input] ?: models\Element_OphCiExamination_VisualAcuity::model()->getSetting('unit_id');
$this->va_unit = models\OphCiExamination_VisualAcuityUnit::model()->findByPk($va_unit_id);
$chart = $this->configureChart();
$this->addData($chart);
$this->render(get_class($this), array('va_unit' => $this->va_unit, 'chart' => $chart));
}