Table 2

Measures of visual acuity and contrast sensitivity

Number of studies reportingDistance
(n=20)
Intermediate
(n=4)
Near
(n=20)
Contrast sensitivity
(n=14)
Unaided183182
Best corrected
(for distance)
14291
Best corrected (for near)7
Best spectacle corrected33
Presenting (with/without prescribed spectacles)11
OtherCorrected but not specified how
(1 study)
−1.25 D addition
(1 study)
Distance vision plus 2.75 reading additions
Plus −2.5 D ‘with near correction’
Distance refraction with addition unspecified
Unclear or not reported (8 studies)
Plus 2.75 D when testing near contrast sensitivity (1 study)