Which vision-related condition could disqualify a driver?

Color blindness and progressive eye diseases can disqualify a driver primarily due to the potential impact on safety and the ability to respond to traffic signals and signs. Color blindness might hinder a driver's ability to recognize certain traffic lights or signals effectively, which is crucial for safe driving. Additionally, progressive eye diseases, such as glaucoma, cataracts, or macular degeneration, can severely impair vision over time, leading to a greater risk of accidents as the driver's ability to see important visual cues diminishes.

In contrast, short-sightedness, or myopia, and refractive errors, like astigmatism or hyperopia, can often be corrected with glasses or contact lenses, allowing individuals to qualify for driving under the appropriate visual standards. Night blindness, while it can be a significant impediment to driving safely, does not inherently disqualify a driver unless it reaches a level that severely affects their ability to function on the road. Overall, the emphasis on color blindness and progressive eye diseases reflects concerns around the ongoing and irreparable effects these conditions might have on a driver's visual acuity and overall safety.