Here's why:

* Stem cells are undifferentiated cells with the potential to develop into various cell types.

* Multipotent stem cells have the ability to differentiate into a limited number of cell types, usually within a specific lineage or tissue. In this case, the eye stem cells can only become a few specific types of eye cells.

Let me know if you would like to know more about the specific types of eye cells these stem cells can differentiate into!