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for my $var (@vars) {
    print "Value: " . $hash_ref->{lc $var} . "\n" if exists $hash_ref-
+>{lc $var};
}

for my $var (@vars) {
    my $new_var = lc $var;
    print "Value: " . $hash_ref->{$new_var} . "\n" if exists $hash_ref
+->{$new_var};
}

for my $var = lc $_ (@vars) {
    print "Value: " . $hash_ref->{$var} . "\n" if exists $hash_ref->{$
+var};
}