RETROSPECTIVE EVALUATION OF ALTERNATIVE VISION SCREENING CRITERIA FOROLDER AND YOUNGER DRIVERS

Visual examinations of 12,400 drivers in Pennsylvania were conducted a t the time of their license renewal. Static binocular tests of visual acuity, horizontal visual field, and contrast sensitivity at varying s patial frequencies were given to license renewal operators who were un aware that their vision would be tested when they arrived at a facilit y where license photographs are processed. Examination results were co rrelated with involvement in selected crash categories over a 3.67-yea r period, taking (self-reported) mileage into account. Neither visual acuity nor horizontal visual field measures in isolation were signific antly related to crash involvement. The combination of visual acuity, horizontal visual fields, and broad contrast sensitivity criteria was significantly related to increasing crash involvement for drivers aged 66-75 and 76 and over. The implications of including contrast sensiti vity measures in driver vision screening protocols are considered.