For years, the dose limit of 150 mSv for occupational exposure of the lens of the eye to ionising radiation was rarely exceeded, and the dose to the eye was only monitored occasionally. With the national implementation of the European Basic Safety Standards in 2018, this dose limit was reduced to 20 mSv and the Member States are expected to implement an adequate system for the monitoring of category A workers. Where the system for monitoring the whole body dose is settled in most countries, this is not the situation for the lens of the eye. This article presents a system for eye lens dose monitoring, based on the particle type, energy, angle of incidence and geometry of the radiation field and the use of protective measures. The system provides recommendations for the adequate operational quantity and dosemeter position for some of the most relevant workplaces.