Final answer:
Cataractogenesis, the development of cataracts, can occur with chronic exposure to UV radiation and certain levels of ionizing radiation. Doses as low as 2 Gy (200 Rads) have been associated with cataract formation, though individual sensitivities to radiation can vary.
Step-by-step explanation:
The question pertains to the threshold radiation dose that may lead to cataractogenesis, which is the formation of cataracts in the eyes. While the question specifics about exposure in Rads are not directly provided in the references, we understand that cataracts can be formed due to chronic exposures of ultraviolet light, specifically UV-B. According to radiation safety standards, acute exposure to highly significant doses (in the order of several hundred Rads or rem) is mostly related to immediate and lethal effects, while lower doses (less than ~50 rem) might have more limited immediate health impacts but could cause long-term health problems like cancer or genetic changes. For the specific dose in Rads that leads to cataract formation, professional literature suggests that doses as low as 2 Gy (200 Rads) can cause cataracts, although sensitivity may vary among individuals.