Author : Justin Thomas Carroll
Publisher :
ISBN 13 :
Total Pages : 218 pages
Book Rating : 4.:/5 (841 download)
Book Synopsis The Effect of Driver Cataract Development on Roadway Sign Nighttime Legibility by : Justin Thomas Carroll
Download or read book The Effect of Driver Cataract Development on Roadway Sign Nighttime Legibility written by Justin Thomas Carroll and published by . This book was released on 2003 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research has shown a relationship between vehicle accidents and the loss of visual acuity resulting from cataracts. It has also been found that older drivers with cataracts are 2.5 times more likely to be involved in a crash than those who do not have cataracts. However, past studies have not determined the level of cataract development required to affect a driver's performance. This study investigated the relationship between levels of cataract development and legibility of roadway signs at night. Subjects seated in a stationary vehicle on a simulated two-lane roadway, attempted to read seven yellow warning signs with black numerical legends. Signs with seven luminance levels, with and without opposing headlight glare were viewed at two viewing locations. The subjects included persons with no cataracts, early cataracts, visually significant cataracts, and persons who had their cataracts surgically removed. The study results show that subjects with early cataracts and significant cataracts identified fewer signs correctly for all sign luminance levels with and without glare present than did subjects with no cataracts and subjects who had their cataracts surgically removed. The study results suggest that a functional disability exists for drivers with early cataracts as well as developed cataracts when reading highway signs at night. This visual disability is more severe for low sign luminance levels. The results also suggest that surgical removal of cataracts returns a driver's performance to a level approximating that of an individual with no cataracts.