public function rules()
{
return array(array('eye_id, reading_time, reading_id, instrument_id, qualitative_reading_id', 'safe'), array('eye_id, reading_time', 'required'), array('eye_id', 'in', 'range' => array(\Eye::LEFT, \Eye::RIGHT)), array('reading_time', 'match', 'pattern' => '/^\\d{2}:\\d{2}$/', 'message' => '{attribute} must be in format HH:MM'));
}