Particulars Number of patients Population* Incidence+ Bacterial   ulcers++   NO. (%) Incidence   Viral ulcers++   NO. (%) Incidence   Fungal ulcers++   NO. (%) Incidence   Protozoal ulcers++ NO. (%) Incidence   Chlamydial ulcers++ NO. (%) Incidence Retrospective study                 1997 208 488,400 42.6 102 (49) 20.9 50 (24) 10.2 2 (1) 0.4 1 (0.5) 0.2 2 (1) 0.4 1998 257 488,600 52.6 106 (41.2) 21.7 76 (29.6) 15.6 0 (--) --- 3 (1.2) 0.6 2 (0.8) 0.4 1999 264 487,700 54.1 110 (41.7) 22.6 82 (31.1) 16.8 1 (0.4) 0.2 1 (0.4) 0.2 1 (0.4) 0.2 2000 236 487,942 48.4 109 (46.2) 22.3 98 (41.5) 20.1 1 (0.4) 0.2 2 (0.8) 0.4 2 (0.8) 0.4 2001 268 489,000 54.8 110 (41) 22.5 77 (28.7) 15.7 0 (--) --- 2 (0.7) 0.4 2 (0.7) 0.4 2002 272 490,900 55.4 113 (41.5) 23 77 (28.3) 15.7 1 (0.4) 0.2 1 (0.4) 0.2 1 (0.4) 0.2 2003 281 493,200 57.0 128 (45.6) 26 68 (24.2) 13.8 3 (1.1) 0.6 1 (0.4) 0.2 2 (0.7) 0.4 Total 1786 489,391** 52.1 778 (43.6) 22.7 528 (29.6) 15.4 8 (0.4) 0.2 11 (0.6) 0.3 12 (0.7) 0.4 Prospective study                 2006 201 499,100 40.3 117 (58.2) 23.4 40 (19.9) 8.0 3 (1.5) 0.6 1 (0.5) 0.2 2 (1) 0.4

* Population of Portsmouth area includes population of Portsmouth town and the catchment areas served by QAH + Incidence is given per 100,000 persons of population in every given year ++ Some of these values are not pure (mixed with other micro-organisms) ** Average population in 7 years

Table 1: Incidence and annual distribution of infectious corneal ulcers in the retrospective and prospective studies