When we consider the ability to open our eyes , there are limitations & challenges at times such as blind spots or color blind.
There is another level that has been linked to the plague of Darkness in the Torah , Shmos 10:23. It says that it was so dark that the Egyptians could not see each other.
A person could not see his brother. !
This can apply in many ways when we fail at times to see each others needs with sufficent concern.
Now may be a good time for a gem of Torah study.
www.GemsofTorah.com