What proof do you need to extend the period of validity of your driving licence?

To extend the validity period of certain driving licences in Germany, such as for professional drivers, you must provide proof of your aptitude (that you are still fit to drive) and proof of your vision (that your eyesight meets the required standard). Proof of first aid training is not required for the extension—this is only needed when first obtaining the licence. So, answers 1 and 2 are correct, confirming that you need to show your aptitude and your vision. Knowing this helps you remember what documents are important for renewals versus for the initial application.