What is the required binocular acuity for the poorer eye for vision correction?

The requirement for binocular acuity for the poorer eye is set at 20/50. This standard ensures that individuals can see adequately with their less dominant eye, which is particularly important for safety when operating a vehicle, including for chauffeurs. A vision level of 20/50 means an individual can see at 20 feet what a person with normal vision can see at 50 feet. This level of vision is typically sufficient for many driving scenarios, supporting the goal of maintaining road safety while accommodating those who may not have perfect vision in both eyes.

The other options represent vision levels that may not meet the minimum requirements set for safe driving operations. For example, 20/40 vision could be too lenient for the poorer eye, leading to potential visual difficulties in certain driving conditions. Meanwhile, 20/60 and 20/70 would indicate even lower acuity, which may significantly hinder an individual's ability to perceive road signs, hazards, and other important visual cues while driving. Therefore, 20/50 serves as a crucial benchmark to ensure both the driver's and public's safety on the road.