What is the maximum certification duration for individuals with progressive vision disorders?

Individuals with progressive vision disorders are typically only certified for a maximum duration of 1 year due to the unpredictable nature of their condition. As the disorder progresses, their vision may deteriorate, impacting their ability to safely operate a vehicle. By restricting the certification to 1 year, this policy ensures that drivers undergo regular medical evaluations to assess their vision and overall fitness to drive, thereby prioritizing safety on the roads. This shorter renewal period allows for timely reassessment, which is crucial for managing progressive conditions effectively.