MedPath

Evaluating and Improving Functional Driving Vision of Patients With Astigmatism

Not Applicable
Completed
Conditions
Astigmatism
Interventions
Device: 1-DAY ACUVUE® MOIST contact lenses
Device: 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses
Other: No contact lenses
Registration Number
NCT02624791
Lead Sponsor
University of Virginia
Brief Summary

Small amounts of astigmatism are often uncorrected in contact lens wearers. The effect with respect to driving is unknown, but it could threaten safe operation of a motor vehicle, especially under conditions such as nighttime driving when visual abilities are highly challenged. This study measures driving-specific visual abilities and simulated driving performance in participants with astigmatism who either have or do not have their astigmatism corrected. The primary hypothesis is that at a tactical level, contact lenses correcting for astigmatism will result in safer driving performance overall. The secondary hypothesis is that at an operational level, contact lenses correcting for astigmatism will result in better driving-specific visual performance.

Detailed Description

Safe driving relies heavily on "good vision." Good vision while driving relates to multiple abilities, such as dynamic visual acuity, contrast sensitivity, management of glare and peripheral vision, etc. While spherical contact lenses address issues of correction of visual acuity as determined by forward static vision tests, if they do not provide visual acuity both immediately and smoothly with eye movement then vision can be compromised. Glare can be a problem as well when contact lenses are off center. Fluctuating vision as a result of lens movement on the eye could be especially problematic and frustrating for patients who have astigmatism. Furthermore, experiencing moments of blurred vision no matter how brief can be potentially hazardous while driving. The 1\*DAY ACUVUE® MOIST for ASTIGMATISM contact lenses have a unique blink-activated stabilization system to prevent rotation of the lens on the eye, and may have significant visual advantages for drivers with astigmatism. These lenses provide continuous corrected acuity compared to non-ballasted contact lenses, and thus are potentially safer for driving. Contact comparison will consist of 1\*DAY ACUVUE® MOIST (spherical control) versus 1\*DAY ACUVUE® MOIST for ASTIGMATISM (the daily disposable astigmatism alternative).

The study will investigate the potential advantages of contact lenses specifically designed to correct for astigmatism, compared to similar correction with spherical contacts, for adult licensed drivers with astigmatism, employing a double-blind (subjects and research assistant blind to hypotheses), randomized, cross-over design (spherical, vs. astigmatism contacts). This will be a multi-stage study comprised of the following:

Preliminary study to determine the likelihood of detecting a significant difference between the standard spherical and astigmatism contacts in a full Randomize Clinical Trial (n=12; data and power analysis)

Recruitment & Eligibility

Status
COMPLETED
Sex
All
Target Recruitment
11
Inclusion Criteria
  • Adult licensed drivers between the ages of 18-39, similar number of males and females will be studied who meet the following inclusion criteria:
  • Bilateral corrected vision of 20/40 or better
  • Bilateral astigmatism between 0.75 to 2.0 diopters, with spherical correction from -1 to -6
  • No active eye infection
  • No defective peripheral vision
  • Do not have correction for bifocals
  • Routinely wear contact lenses more than 4 times per week
  • Routinely drive a car more than 4 times week
  • Do not have a history of motion, sea or big screen (e.g. IMAX) sickness or experience persistent Simulation Adaptation Syndrome
Read More
Exclusion Criteria
  • Bilateral corrected vision of worse than 20/40
  • No astigmatism
  • Active eye infection
  • Defective peripheral vision
  • Wear bifocals
  • Wears contact lenses less than 4 times per week
  • Drives infrequently (less than 4 times per week)
Read More

Study & Design

Study Type
INTERVENTIONAL
Study Design
CROSSOVER
Arm && Interventions
GroupInterventionDescription
Lens sequence 11-DAY ACUVUE® MOIST for ASTIGMATISM contact lensesNo contact lenses; 1-DAY ACUVUE® MOIST contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses
Lens sequence 21-DAY ACUVUE® MOIST contact lensesNo contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; 1-DAY ACUVUE® MOIST contact lenses
Lens sequence 2No contact lensesNo contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; 1-DAY ACUVUE® MOIST contact lenses
Lens sequence 31-DAY ACUVUE® MOIST contact lenses1-DAY ACUVUE® MOIST contact lenses; No contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses
Lens sequence 51-DAY ACUVUE® MOIST contact lenses1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; 1-DAY ACUVUE® MOIST contact lenses; No contact lenses
Lens sequence 51-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; 1-DAY ACUVUE® MOIST contact lenses; No contact lenses
Lens sequence 21-DAY ACUVUE® MOIST for ASTIGMATISM contact lensesNo contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; 1-DAY ACUVUE® MOIST contact lenses
Lens sequence 3No contact lenses1-DAY ACUVUE® MOIST contact lenses; No contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses
Lens sequence 41-DAY ACUVUE® MOIST contact lenses1-DAY ACUVUE® MOIST contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; No contact lenses
Lens sequence 41-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses1-DAY ACUVUE® MOIST contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; No contact lenses
Lens sequence 11-DAY ACUVUE® MOIST contact lensesNo contact lenses; 1-DAY ACUVUE® MOIST contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses
Lens sequence 31-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses1-DAY ACUVUE® MOIST contact lenses; No contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses
Lens sequence 61-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; No contact lenses; 1-DAY ACUVUE® MOIST contact lenses
Lens sequence 6No contact lenses1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; No contact lenses; 1-DAY ACUVUE® MOIST contact lenses
Lens sequence 1No contact lensesNo contact lenses; 1-DAY ACUVUE® MOIST contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses
Lens sequence 4No contact lenses1-DAY ACUVUE® MOIST contact lenses; 1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; No contact lenses
Lens sequence 5No contact lenses1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; 1-DAY ACUVUE® MOIST contact lenses; No contact lenses
Lens sequence 61-DAY ACUVUE® MOIST contact lenses1-DAY ACUVUE® MOIST for ASTIGMATISM contact lenses; No contact lenses; 1-DAY ACUVUE® MOIST contact lenses
Primary Outcome Measures
NameTimeMethod
Tactical Composite Score1 day laboratory study

Z-score composite of tactical testing outcomes

Secondary Outcome Measures
NameTimeMethod
Operational Composite Score1 day laboratory study

Z-score composite of operational testing outcomes

Trial Locations

Locations (1)

University of Virginia Driving Safety Lab

🇺🇸

Charlottesville, Virginia, United States

© Copyright 2025. All Rights Reserved by MedPath