I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 53)

Section 5: Selecting the Recognition Options
48
Important: select the document language before executing page
analysis when you are dealing with Asian or Hebrew documents.
Specific page analysis algorithms are used for these documents.
Tip Readiris Pro: in case you want to recognize documents in multiple
languages, make sure to select the language with the largest character set.
E.g. if you want to recognize a document that contains both English and
French text, select French as document language. This way, the accents will
be recognized correctly.
Other Recognition Options
Recognizing Numeric Documents
When you are processing documents that only contain numbers and
almost or no text, then it is recommended to select the Numeric
option:
 Click the language list and select Other Languages.
 Then select Numeric at the top of the list.