Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Multifocal contact lenses may reduce vision for night driving

04.11.2010
A new study suggests that older adults who wear multifocal contact lenses to correct problems with near vision, a very common condition that increases with age, may have greater difficulty driving at night than their counterparts who wear glasses. Age-related problems with near vision, medically termed presbyopia, usually occurs after the age of 40 and results in the inability to focus on objects up close.

According to an article published in Investigative Ophthalmology & Visual Science ("The Effect of Presbyopic Vision Corrections on Nighttime Driving Performance"), wearing multifocal contact lenses resulted in significantly slower driving speeds at night than wearing progressive addition glasses. While slower driving would seem to reduce the likelihood of hitting nighttime road hazards, the authors reported a reduced ability to recognize road hazards among multifocal contact lens wearers.

The study also showed that multifocal contact lens wearers were able to see road signs, but at a much shorter distance than those wearing glasses, potentially decreasing the reaction time required for a driver to make necessary navigational decisions.

"For those patients who drive long distances and hours at night, practitioners should carefully consider the best form of correction of presbyopia for these patients," said author Byoung Sun Chu, PhD, formerly of the School of Optometry, Queensland University of Technology, Brisbane, Australia. "One alternative is to prescribe the multifocal contact lenses for daytime use and a different correction for driving at night."

The research team conducted an experiment with 11 older adults between ages 45-64 years whose only experience with wearing lenses to correct problems with near vision was reading glasses. The study participants drove on a closed circuit driving track at night and performance was measured for five areas: road sign recognition, road hazard recognition and avoidance, lane keeping, near target recognition and distance to recognize standard street signs.

Chu points out that the relatively small sample size is likely to have led to an underestimation of some of the differences in driving performance between conditions, given that a number of the differences in driving performance almost reached statistical significance.

In addition to conducting studies with a larger sample size to confirm the findings, the author suggests future studies be performed to determine whether the outcomes found in this study for older adults with no experience wearing lenses to correct problems with near vision (other than reading glasses) will persist after adaptation to wearing the corrective lenses for a longer period of time.

"It is important that the results of this study are also used as a stimulus for improving the optical qualities of multifocal contact lenses to improve night time driving," added Chu.

Katrina Norfleet | EurekAlert!
Further information:
http://www.arvo.org

More articles from Health and Medicine:

nachricht Correct connections are crucial
26.06.2017 | Charité - Universitätsmedizin Berlin

nachricht One gene closer to regenerative therapy for muscular disorders
01.06.2017 | Cincinnati Children's Hospital Medical Center

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Can we see monkeys from space? Emerging technologies to map biodiversity

An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.

Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...

Im Focus: Climate satellite: Tracking methane with robust laser technology

Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.

Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...

Im Focus: How protons move through a fuel cell

Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.

As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...

Im Focus: A unique data centre for cosmological simulations

Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.

With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...

Im Focus: Scientists develop molecular thermometer for contactless measurement using infrared light

Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine

Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Plants are networkers

19.06.2017 | Event News

Digital Survival Training for Executives

13.06.2017 | Event News

Global Learning Council Summit 2017

13.06.2017 | Event News

 
Latest News

Touch Displays WAY-AX and WAY-DX by WayCon

27.06.2017 | Power and Electrical Engineering

Drones that drive

27.06.2017 | Information Technology

Ultra-compact phase modulators based on graphene plasmons

27.06.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>