| Group 1: Very Favorable |
|---|
| a. Solitary tumor less than 4 disc diameter (DD) in size, at or behind equator. b. Multiple tumors, none over 4 DD in size, all at or behind equator. |
| Group 2: Favorable |
| a. Solitary tumor, 4 to 10 DD in size, at or behind equator. b. Multiple tumors, 4 to 10 DD in size, behind equator. |
| Group 3: Doubtful |
| a Any tumor anterior to equator. b. Solitary tumor, larger than 10 DD, behind equator. |
| Group 4: Unfavorable |
| a. Multiple tumors, some larger than 10 DD in size. b. Any lesion extending anteriorly to the ora serrata. |
| Group 5: Very Unfavorable |
| a. Massive tumor involving over half the retina. b. Vitreous seeding. |
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