The Campaign for Real Ale's (CAMRA) definition of "real perry" is in parallel to that of real cider:
"DEFINITION OF REAL DRAUGHT CIDER & PERRY
A) INGREDIENTS
B) PROCESS
Commercial Light Perries
Like commercial pale lager and commercial cider, commercial perry is highly processed and often contains large quantities of cereal adjuncts such as corn syrup or invert sugar. It is also generally of lower strength than real perry.
