Visually impaired drivers experienced nearly a 1-second improvement in hazard detection times with bioptic telescopic spectacles, although their response times remained slower than those of normal sighted drivers, according to new study results.

Published in Translational Vision Science & Technology, 21 bioptic drivers and 21 normal sighted controls were assessed on visual acuity, contrast sensitivity, and visual field. Patients completed a Driving Habits Questionnaire and underwent hazard perception testing using first-person video driving clips. Bioptic drivers were evaluated in alternating sessions with and without bioptic telescopes. Hazard detection times were converted to z-scores for comparison.

The hazard response time of bioptic drivers improved when using the bioptic telescope (5.4 ± 1.4 seconds) compared with nonusers (6.3 ± 1.8 seconds). However, their response times remained significantly longer than those of controls (4.0 ± 1.4 seconds). Worse visual acuity, reduced contrast sensitivity, and superior visual field loss were linked to longer hazard response times.

The authors reported no conflict of interest.