What is the difference between using the 能 and 得 potential forms? For example, "我不能睁开我的眼睛" and "我睁不开我的眼睛" (不 obviously being the negation of the 得 potential form). What is the difference in nuance between these two sentences?
我不能睁开我的眼睛


This sentence means, "I cannot open my eyes," with the implication that the speaker is not allowed to or otherwise constrained.


  我睁不开我的眼睛


This sentence means, "I am physically incapable of opening my eyes." (睁不开 sounds like, "[my eyes] are unopenable").