protected function generateStructuredVA()
{
return array(array('', '', ''), array('Unaided', $this->unaided_right_va, $this->unaided_left_va), array('Best corrected', $this->best_corrected_right_va, $this->best_corrected_left_va), array('Best corrected with both eyes', $this->best_corrected_binocular_va, ''));
}