get_page custom field question

HI guys

I have a question.

<?php foreach ( $pages as $page ) {
            			$option = '<li><a href="'. get_page_link( $page->ID ) .'">' . $page->post_title . '<span>'. $page->meta_value . '</span></a></li>';
						echo $option;
				}

I was trying to get the value of the custom field that I made. is it meta_value? or something else? I was trying even the function but it isn’t working.

Thanks in advance.