Which of the following statements is true about the eye test for licensing before January 1935?

The statement that the eye test for licensing was not introduced until January 1935 is accurate. Prior to this date, various states had different requirements for obtaining a driver's license, and many did not involve standardized testing for vision. The introduction of the eye test aimed to ensure that drivers had the necessary visual acuity to operate a vehicle safely, marking a significant step towards more rigorous licensing requirements that prioritize road safety.

The other options suggest incorrect aspects of the history of driver's licensing tests before that date. For instance, stating that it was the only test required would overlook the fact that there might have been different methods of assessment in place prior to then. Similarly, the notion that the eye test replaced the written knowledge test does not align with historical practices, which typically included both forms of assessment for safer driving. Lastly, the idea that it was conducted at random intervals implies inconsistency in testing that would not have effectively ensured driver competency.