Inheritance: extends BaseActiveRecordVersioned
 /**
  * @param Event                                 $event
  * @param \FlotChart                            $chart
  * @param OphCiExamination_VisualAcuity_Reading $reading
  * @param string                                $side
  */
 protected function addVaReading($event, \FlotChart $chart, models\OphCiExamination_VisualAcuity_Reading $reading, $side)
 {
     $series_name = "Visual Acuity ({$side})";
     $label = "{$series_name}\n{$reading->element->unit->name}: {$reading->convertTo($reading->value)} {$reading->method->name}";
     $chart->addPoint($series_name, Helper::mysqlDate2JsTimestamp($event->event_date), $reading->value, $label);
 }
 /**
  * @param $baseValue
  *
  * @return float
  */
 protected function convertVisualAcuity($baseValue)
 {
     $logMar = OphCiExamination_VisualAcuityUnit::model()->find('name = "logMAR"');
     $reading = new OphCiExamination_VisualAcuity_Reading();
     return (double) $reading->convertTo($baseValue, $logMar['id']);
 }