I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 77)

Section 7: Editing the Recognition Zones
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Viewing the Recognition Zones
Several viewing options are available allowing you to inspect the
opened images and their recognition zones.
Changing the View Size
 Click the Size icon on the Image and Layout Editing toolbar.
 Then select the required option.
Note that you can also use keyboard shortcuts to apply these
viewing options.
Zooming in on images
 Click the Loupe icon on the Image and Layout Editing toolbar.
 Then move the Loupe over the image.
You can also use the keyboard to zoom in on images:
 Shift-click on an image to zoom in.
 Then Alt-click on the image to grab it and move to another
section of the image.