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. 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. 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. 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. 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. 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