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| Progression | +1 | >10% increase in retinal lesion number |
| +2 | >50% increase in size of ≥1/3 of lesions | |
| +3 | >5 fused lesions or appearance of >2 chorioretinal scars | |
| +4 | diffuse chorioretinal scars | |
| Regression | −1 | >10% decrease in retinal lesion number |
| −2 | >50% decrease in size of ≥1/3 of lesions | |
| −3 | >50% disappearance of retinal lesions | |
| −4 | total disappearance of retinal lesions |
