Final answer:
At a lens dose of 150 mSv, protective measures such as wearing eye protection, limiting exposure, and using shielding should be taken to avoid cataracts and vision loss.
Step-by-step explanation:
When the dose to the lens of the eye could reach 150 mSv, it is recommended that protective measures are taken to reduce exposure to ionizing radiation. This is crucial since high doses of radiation to the eye can increase the risk of developing cataracts, which can lead to vision loss. Eye protection, limiting exposure time, and using leaded shields or glasses can be effective in reducing the dose received by the lens of the eye.