Background: In Japan, new regulations that revise the dose limit for the lens of the eye (hereafter the lens), operational quantities, and measurement positions for the lens dose were enforced in April 2021. Based on the international safety standards, national guidelines, the results of the Radiation Safety Research Promotion Fund of the Nuclear Regulation Authority, and other studies, the Working Group of Radiation Protection Standardization Committee, the Japan Health Physics Society (JHPS) developed a guideline for radiation dose monitoring for the lens.Materials and Methods: The Working Group of the JHPS discussed the criteria of non-uniform exposure and the management criteria set not to exceed the dose limit for the lens.Results and Discussion: In July 2020, the JHPS guideline was published. The guideline consists of three parts: main text, explanations, and 26 examples. In the questions, the corresponding answers were prepared, and specific examples were provided to enable similar cases to be addressed.Conclusion: With the development of the guideline on radiation dose monitoring of the lens, radiation managers and workers will be able to smoothly comply with revised regulations and optimize radiation protection.

In 2011, for occupational exposure in planned exposure situations, the International Commission on Radiological Protection years, with no single year exceeding 50 mSv. Japanese regulatory authorities started discussions on the dose limit to the lens in 2017. In April 2021, new regulations related to the dose limit to the lens will take effect. Employers should comply new related regulations and optimize radiation protection. On June 30, 2020, the second day of the 53rd Annual Meeting of the Japan Health Physics Society (Web conference), the live symposium entitled "Symposium for Radiation Protection of the Lens of the Eye (Webinar)" was held. In this symposium, new guidelines for the lens dose monitoring and for the safety management of medical staff were introduced. In addition, the current status and issues in the nuclear, medical and individual monitoring fields were reported and discussed. In this paper, we reconsidered the presentations of this symposium and discussed radiation protection on the lens of the eye in the future.