use CGI;
%var_name = (
       opp              => 'Operation',
       name             => 'Name',
            );
for $vname (keys %var_name){
    $statement='$'.qq!$vname = param('$vname')!;
    # this did not work
    eval{ $statement };
    # nor did this
    ${statement};
    print "$vname is $${vname}<br>\n";
}

##</code><code>##

$opp=param('opp');
$name=param('name');