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Driving with the BiOptic Telescope in California

Driving with the BiOptic Telescope in California. DMV Perspective 2004 International BiOptic Driving Conference. California DMV. Background Info BTL Licensing Policies & Procedures 1983 BTL Study Reports Assessing Driving Fitness with Three-Tier Assessment System.

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Driving with the BiOptic Telescope in California

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  1. Driving with the BiOptic Telescope in California DMV Perspective 2004 International BiOptic Driving Conference David F. Hennessy PhD California Department of Motor Vehicles

  2. California DMV Background InfoBTL Licensing Policies & Procedures1983 BTL Study ReportsAssessing Driving Fitness with Three-Tier Assessment System dhennessy@dmv.ca.gov

  3. N = 23 million Licensed Drivers in California dhennessy@dmv.ca.gov

  4. California Department of Motor VehiclesN = 9,000 EmployeesN = 168 Field officeshttp://www.dmv.ca.gov/ dhennessy@dmv.ca.gov

  5. Research and Development BranchN = 11 Research StaffDevelop and Evaluate Traffic Safety Programshttp://www.dmv.ca.gov/about/profile/rd/rdtoc.htm dhennessy@dmv.ca.gov

  6. N= 400-500 California Drivers validly licensed to use a Bioptic Telescopic Lens dhennessy@dmv.ca.gov

  7. BTL Licensing Policies and ProceduresReport of Vision ExaminationDiagnosisPrognosisVision-Related Driving Advice dhennessy@dmv.ca.gov

  8. Visual Acuity with the Carrier Lens must be better than 20/200Field of Vision must extend out to at least 75 degreesto the far right & far left dhennessy@dmv.ca.gov

  9. Must have completed training in using BTLMust pass DMV road test that includes freeway driving OrAccept restriction from freeway driving dhennessy@dmv.ca.gov

  10. May not renew license by mail Automatically restricted from nighttime driving - May be challenged dhennessy@dmv.ca.gov

  11. Challenging restriction from nighttime driving:Optometrist or ophthalmologistmust not have advised against night drivingMust pass nighttime road test dhennessy@dmv.ca.gov

  12. BTL Controversy-California DMV StudyJanke, M. & Kazarian, G. 1983DMV Report #86Janke, M. 1983Journal of Safety ResearchVolume 14, pp. 159-165 dhennessy@dmv.ca.gov

  13. dhennessy@dmv.ca.gov

  14. When the Janke 1983 analysis was confined to only validly licensed drivers, the adjusted mean accident rates for BTL drivers are not significantly higher than the general driving population. dhennessy@dmv.ca.gov

  15. Two General Limitations of BTL Studies Do not know whether BTL was actually worn or used when accident-involved Amalgamation errors dhennessy@dmv.ca.gov

  16. Ophthalmologists’ Waiting Rooms • 50% Designated Drivers Best Corrected VA = 20/20 • 50% Patients Best Corrected VA=20/80 • Overall Mean VA =20/40 dhennessy@dmv.ca.gov

  17. My conclusion? The people sitting in ophthalmologists’ waiting rooms meet the California DMV 20/40 screening standard Amalgamation Error dhennessy@dmv.ca.gov

  18. Treating BTL drivers as though they are a functionally unitary group is no less an amalgamation error dhennessy@dmv.ca.gov

  19. Congenital and Stable(ocular albinism )+Progressive(age-related macular degeneration)= Amalgamation Error dhennessy@dmv.ca.gov

  20. Reduced Central Vision Only(age-related macular degeneration)+Both Reduced Central Vision and Peripheral Fields(retinitis pigmentosa) = Amalgamation Error dhennessy@dmv.ca.gov

  21. Proficient in Spotting while keeping both eyes open+Minimally trained in the use of the BTL= Amalgamation Error dhennessy@dmv.ca.gov

  22. The Overall Mean accident rates for BTL drivers are artifacts produced by amalgamating entirely different subgroups. dhennessy@dmv.ca.gov

  23. Conclusions based on the Overall Mean accident rates of BTL drivers are as misguided as concluding that people sitting in ophthalmologists’ waiting rooms meet the California DMV 20/40 screening standard. dhennessy@dmv.ca.gov

  24. Assessing Driving FitnessWithA Three-Tier Assessment System dhennessy@dmv.ca.gov

  25. The overarching goal of the three-tier system is to keep drivers driving safely for as long as possible. dhennessy@dmv.ca.gov

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