What are the Limits of Binocularity for Driving Licences for Professional Purposes?
University Eye Clinic, Heidelberg
Purpose: The German standards of physical fitness for driving a power-driven vehicle had been revised in August 2002. For group 2 (driving licences for professional purposes), the applicants must no longer have no squint as in former times, but they are excluded, if they do squint without having constant binocular vision. The question arises, what this definition means.
Results: A positive relationship between impaired binocular vision and frequency of accidents is valid for manifest strabismus and reduced stereopsis (Lachenmayr et al, 1996). On the other side, it is true that most drivers are still going to work for tenths of years without accidents, even if they have no constant binocular vision. It seems advisable to recommend graduated permissions for driving licences for professional purposes. Higher standards are proposed for bus drivers (class D), intermediate ones for lorry drivers (class C) and low ones for taxis drivers carrying not more than eight persons.
Conclusions: The minimum standards of physical fitness of sight for driving a power-driven vehicle should be set corresponding to the class of driving license and interpreted individually, if applicants are experienced drivers without accidents. A qualified compromise should be found in each individual case. The new recommendations of the german ophthalmological society are discussed in details concerning binocular vision and stereopsis for the different groups.
Zurück | Back