The SQL Developer Installation Guide contains Section 1.9, "Using a Screen Reader and Java Access Bridge with SQL Developer". You should be able to access it directly at: http://docs.oracle.com/cd/E35137_01/doc.32/e35119/install.htm#CIHFHGFG
If that doesn't work, go to the SQL Developer Online Documentation Library (Release 3.2) at http://docs.oracle.com/cd/E35137_01/index.htm (available by clicking the Documentation link on the SQL Developer 3.2 Start Page or the Documentation tab of the SQL Developer page on the Oracle Technology Network). Then click the HTML or PDF link for the Installation Guide.
I hope that Section 1.9 contains the information that you're looking for.