public function getBestVisualAcuity($patient, $episode, $side) { if ($va = $this->getElementForLatestEventInEpisode($episode, 'models\\Element_OphCiExamination_VisualAcuity')) { switch ($side) { case 'left': return $va->getBestReading('left'); case 'right': return $va->getBestReading('right'); } } }