If I have leukemia, should I consider joining clinical trials?

There are several parts to this question: Yes. It is safe to undergo such surgery as it is in a separate eye. It will have no bearing on surgery that was performed in the other eye. If you are asking about replacing a monofocal IOL with a multi-focal IOL, this is safely performed by a surgeon with sufficient experience and skin in intraocular procedures. Do ask your attending Ophthalmologist what his/her experiences in such procedures are.

Mercury is a toxic heavy metal which is widely dispersed in nature. Most human exposure results from fish consumption or dental amalgam. Human exposure to the vapour of metallic mercury dates back to antiquity but continues today in occupational settings and from dental amalgam. Health risks from methylmercury in edible tissues of fish have been the subject of several large epidemiological investigations and continue to be the subject of intense debate. Mercury is most notable for its neurological effects. Too much mercury can cause numbness, memory issues, anxiety, low mood, and tremors.