Cross-Eye Viewing
The most popular free-viewing technique for 3D stereo images.
How It Works
In cross-eye viewing, you cross your eyes slightly so that your left eye sees the right image and your right eye sees the left image. When done correctly, a third image appears in the middle — and it's in 3D!
Your left eye → sees → [RIGHT image]
↘
[3D in middle]
↗
Your right eye → sees → [LEFT image]
Step-by-Step Guide
- 1
Get comfortable
Sit at arm's length from your screen. Make sure the stereo pair fills a comfortable portion of your view — not too small, not too large.
- 2
Focus on a finger
Hold your finger about 6 inches in front of your nose, centered between the two images. Focus on your finger — the images behind will appear blurry and doubled.
- 3
Find the overlap
While focused on your finger, notice the images behind. You should see 3 or 4 blurry images. Move your finger closer or farther until the middle two images overlap into one.
- 4
Lock the focus
Once the images overlap, slowly move your finger away (or lower your hand) while maintaining that eye position. The merged image should snap into focus — and you'll see 3D!
- 5
Adjust the gap
Use the gap slider in our viewer to find your optimal separation. Everyone's eyes are different — find what's comfortable for you.
Tips for Success
- 💡
Start with smaller images. They require less eye crossing.
- 🎯
Focus on a specific object in the image once you achieve 3D.
- ⏰
Don't strain. Take breaks every few minutes when starting out.
- 📱
Try on different devices. Some screens work better than others.
Practice Time!
Ready to try? Open the demo viewer and practice with the gap slider.
Open Demo Viewer