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%

The missing values can be calculated by subtracting the total numbers in each of the five groupings from 473.