Table 2
Previous studies of the outcome of optometric referrals for suspected glaucoma
| Authors | Year of publication | Sample size | Confirmed glaucoma (%) | Glaucoma suspect (%) | OHT (%) | No glaucoma,no OHT (%) |
|---|---|---|---|---|---|---|
| *Includes 27 direct GP referrals. | ||||||
| †Figures published in combined diagnostic categories. | ||||||
| ‡Includes 11 direct GP referrals. | ||||||
| NA, not available. | ||||||
| Clearkin and Harcourt | 1983 | 34 | 11 (32) | 2 (6) | 2 (6) | 19 (56) |
| Harrison et al | 1988 | 147* | 33 (22) | 73 (50)† | 41 (28) | |
| Brittain et al | 1988 | 93 | 41 (44) | 20 (22) | NA | 32 (34) |
| Tuck and Crick | 1991 | 704 | 283 (40) | 222 (32)† | 199 (28) | |
| Sheldrick et al | 1994 | 213 | 68 (32) | NA | 48 (23) | 97 (46) |
| Bell and O’Brien | 1997 | 271‡ | 46 (17) | 13 (5) | 113 (42) | 112 (41) |
| Vernon (1988 group) | 1998 | 75 | 36 (48) | 9 (12) | 27 (36) | 3 (4) |
| Vernon (1993 group) | 1998 | 71 | 24 (34) | 11 (15) | 16 (23) | 20 (28) |
| Newman et al | 1998 | 82 | 35 (43) | 1 (1) | 16 (20) | 30 (37) |
| Theodossiades and Murdoch | 1999 | 87 | 19 (22) | 18 (21) | 12 (14) | 38 (44) |
| Pooley and Frost | 1999 | 19 | 5 (26) | NA | NA | NA |
| Vernon and Ghosh (control group) | 2001 | 105 | 39 (37) | 9 (9) | 17 (16) | 40 (38) |
| Vernon and Ghosh (intervention group) | 2001 | 102 | 32 (31) | 7 (7) | 19 (19) | 44 (43) |
| Theodossiades et al (control group) | 2004 | 119 | 55 (46)† | NA | NA | |
| Theodossiades et al (intervention group) | 2004 | 210 | 102 (49)† | NA | NA | |
| Bowling et al | 2005 | 2506 | 511 (20) | 125 (5) | 747 (30) | 1123 (45) |
