Your code doesn't work because it's using blockwise eval, instead of string eval. These are very different constructs.

As the other reponses have mentioned, though, eval is probably not the best option. You should consider storing your values in a hash, then you don't have to mess with eval or soft references. Here's an example:

use CGI;

my %var_name = (
    opp  => 'Operation',
    name => 'Name',
);

my %values;

for my $vname (keys %var_name){
    $values{$vname} = param($vname);
    print "$vname is $values{$vname}<br>\n";
}
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