OEModule\OphCiExamination\models\Element_OphCiExamination_OpticDisc::checkDiameter PHP Method

    public function checkDiameter($attribute)
    {
        $side = explode('_', $attribute, 2);
        $side = $side[0];
        if ($this->{$side . '_diameter'} && !$this->{$attribute}) {
            $this->addError($attribute, ucfirst($side) . ' vertical diameter requires lens');
        }
    }