To have the right and left eye on one screen can be very useful when you do an iris diagnosis.
You can do this by doing a few simple clicks
1) Download IrfanView (Free Program)
2) Click the icon on your desktop
3) Click Create panorama
4) Click horizontal
5) Click Add images
6) Select Right eye and OPEN
7) Add image Select Left eye and OPEN
8) Create image
Alternatively if running Windows 10 operating system you can achieve 2 images by pressing the windows keyboard button and the left or right arrows.