Table 2
Relation of acuity threshold to the use of vision tests other than distance acuity
| Number of surgeons | Thresholds worse than 6/6 | Thresholds 6/6 or better | No acuity criterion |
| Use any other test(s) routinely (a) | 96 | 50 | 22 |
| Do not use other tests routinely (b) | 140 | 105 | 33 |
| Percentage using other tests routinely [100×a/(a+b)] | 41% | 32% | 40% |
| Use any other test(s) routinely or occasionally | 227 | 149 | 51 |
| Do not use other tests | 9 | 6 | 4 |
| Percentage using other tests routinely or occasionally | 96% | 96% | 93% |
| Use near acuity tests routinely or occasionally | 225 | 149 | 51 |
| Do not use near acuity tests | 10 | 6 | 3 |
| Percentage using near acuity tests routinely or occasionally | 96% | 96% | 94% |
| Use contrast sensitivity tests routinely or occasionally | 24 | 16 | 7 |
| Do not use contrast sensitivity tests | 204 | 136 | 47 |
| Percentage using contrast sensitivity tests routinely or occasionally | 11% | 11% | 13% |
| Use glare tests routinely or occasionally | 29 | 14 | 5 |
| Do not use glare tests | 193 | 139 | 48 |
| Percentage using glare tests routinely or occasionally | 13% | 9% | 9% |
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The missing values can be calculated by subtracting the total numbers in each of the five groupings from 473.
