Does correcting astigmatism with toric lenses improve driving performance?

Area of Science:

• Ophthalmology and Vision Science
• Human Factors and Ergonomics
• Optometry and Contact Lens Technology

Background:

• Driving is a critical daily activity heavily reliant on visual function.
• Astigmatism can impair driving safety, particularly with suboptimal contact lens correction.
• Spherical lenses may not fully correct astigmatism, while toric lenses can rotate, causing blur.

Purpose of the Study:

• To test if toric contact lenses improve driving performance in astigmatic individuals compared to spherical lenses.
• To evaluate the impact of different contact lens corrections on tactical and operational driving abilities.

Main Methods:

• A within-subject, single-blind, crossover, randomized design was employed.
• Eleven young adults with astigmatism participated in a virtual reality driving simulation.
• Driving performance was assessed with no correction, spherical contact lenses, and toric contact lenses.

Main Results:

• Toric lenses significantly enhanced tactical driving safety compared to no correction.
• Spherical lenses did not show a significant improvement in driving safety over no correction.
• Both spherical and toric lenses improved operational driving abilities, but toric lenses were not significantly better than spherical lenses in these tests.

Conclusions:

• Correcting low to moderate astigmatism with toric contact lenses may be crucial for driving safety.
• Deficits in tactical driving skills are linked to increased collision risk.
• Further research is needed to fully elucidate the benefits of toric versus spherical lens correction for driving.