Table 5. The transition of 153 eyes observed in study from mild NPDR to blindness from the time of first visit to end of year 1.

DR stages	Mild (S1)	Moderate (S2)	Severe (S3)	PDR (S4)	Blindness (S5)
Mild (S1)	0.80	0.12	0.08	0	0
Moderate (S2)	0	0.44	0.30	0.26	0
Severe (S3)	0	0	0.46	0.50	0.04
PDR (S4)	0	0	0	0.88	0.12
Blindness (S5)	0	0	0	0	1