In Iran setting, accepted routine test to take driving license is visual acuity evaluation by Snellen chart which is not adequate for determination of visual ability in real and natural conditions

This was a cross-sectional study performed for 100 drivers that referred to Ophthalmologic clinic of Farshchian hospital .Complete Ophthalmologic examination, visual acuity and contrast sensitivity test were performed

In normal visual acuity, the percent of abnormal contrast sensitivity in appropriative light condition were 0, 0, 6, 10, 16 in right eye and 0, 0, 8, 12, 14 in left eye and reduced light condition were 0, 10, 24, 24, 30 in right eye and 0, 16, 16, 20, 20 in left eye. With abnormal visual acuity, the percent of abnormal contrast sensitivity test in normal light condition were 0, 4,10, 18, 18 in right eye and 0, 2, 12, 14, 22 left eye and 0, 14, 24, 26, 26 and 0, 16, 20, 20, 22 in reduced light.

It is strongly recommended to add contrast sensitivity test results to needed documents of driving license qualification.