Members of certain occupational groups working in radiology, nuclear medicine or nuclear plants are particularly frequently exposed to harmful rays. Excessive doses can lead to health (e.g. cataract). In order to lessen the risk, legal limit values apply for individual organs. By 2018, the limits for the eye lens will be further tightened on the basis of state-of-the-art scientific insights. Devices to measure doses have been applied in various areas, although they are specially designed for measuring skin doses and for certain types of radiation, as is the case with finger ring dosimeters. The human eye is even more sensitive to radiation than the skin. This is why a dosimetric monitoring of the eye is recommendable, although so far, no adequate measuring system has been created for this purpose. KIT scientists can offer a solution. They have specially developed a dose measuring device for eye lenses. In order to raise the acceptance of the dosimeters, attention has been given to comfortable wearing that does not restrict mobility or sight. The compact dosimeter consists of a detector and a filter unit. The two filtering layers of cellulose and aluminium tightly embrace the detector, which is only a few millimetres large. The entire measuring device is safely packed in plastic and can be worn in a headband on the temples, the forehead or above the eyes. The rays first penetrate the filter and then the detector, which absorbs the radiation energy. The detectors are taken off and evaluated at public measuring units. The thermo-luminescent detector is heated, so that the absorbed radiation energy becomes visible as light. With reference measurements, the radiation dose can thus be determined. Once the detectors have been reprocessed, they can be used again. Unlike existing measuring systems, the dosimeters can be used to monitor a wide range of rays or mixed radiation fields. The eye lens dosimeters were successfully tested in survey measurements.