Table 2 Hospital based and home-based orthoptic therapy procedure
Phase | Therapy location | Training technique | Endpoint |
|---|---|---|---|
Phase 1 | Hospital-based therapy | Training with major amblyoscope to build fine retina correspondence | Achieve simultaneous vision and build fusion |
| Â | Â | Cheiroscopic drawing with single oblique stereoscope | Achieve simultaneous vision and build fusion |
| Â | Â | Vectograms (quoits or clowns) for convergence | 33 BO for twice for patients without stereopsis |
| Â | Â | Increasing fusional convergence based on stereoscopic stimuli | 34 BO for twice for patient with stereopsis |
| Â | Home therapy | Red/green bar reader | Maintain single binocular without suppression |
| Â | Â | Barrel card | Easily fuse three dots |
| Â | Â | Brock string | Successfully converge to 2.5 cm from his or her nose. |
| Â | Â | Letter chart monocular accommodative facility (MAF) | Start from 20/50, go to 20/40 or 20/30, when result of MAF is 17.5 cpm |
Phase 2 | Hospital-based vision therapy | Training with major amblyoscope to increase fusional convergence | Fusional convergence reserve is more than +25° (based on different subjective angle of exodeviation, the amount of fusional convergence demand is different) |
| Â | Â | Vectograms (quoits or clowns) for divergence | 15 BI with stereopsis |
| Â | Â | Aperture rule for convergence and divergence | 12 pictures for convergence, 7 pictures for divergence. |
| Â | Â | Random vergence facility based on stereoscopic stimuli | More than 650 times in 15 minutes |
| Â | Home-based vision therapy | Aperture rule | 7 for divergence and 12 for convergence |
| Â | Â | Letter chart BAF | More than 17.5 cpm (20/30) |
| Â | Â | Computerized binocular vision therapy procedure | Achieve clear single binocular vision with 40 to 50 BO and 10 to 15 BI. |
Phase 3 | Hospital-based vision therapy | Training with major amblyoscope to increase fusional convergence | Fusional convergence reserve is more than +25° (based on different subjective angle of strabismus, amount of fusional convergence demand is different) |
|  |  | Aperture rule with lens or prism flipper | Accomplish with ±2.00 lens flipper |
| Â | Â | Random vergence facility based on stereoscopic stimuli | More than 650 times in 15 minutes |
| Â | Â | Bernell-O-Scope for vergence facility | 8 pictures for BI and BO each |
| Â | Â | Free space fusion with lifesaver card | Easily accomplish convergence and divergence |
| Â | Â | VR training that combines pursuit and saccade | Accuracy ratio more than 90% in increasing difficulty |
|  | Home-based vision therapy | Aperture rule with ±2.00 lens flipper | Accomplish 7 in divergence and 12 in convergence |
| Â | Â | Lifesaver card | Easily accomplish divergence and convergence |