You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which of the following foreign body can not be observed as such in retinal coats and need to be removed and explain in detail?
Ine Materials that can be observed inside eye: Nickel Chromium Aluminium Gold Plastic Copper has toxic potential for the ocular tissues and has to be removed