Jesus is talking to a group of people about what they as individuals should or should not do. The instances of "you" and "your" are all singular, but in some languages they may need to be plural. (See: [[rc://en/ta/man/translate/figs-you]])
This compares healthy eyes that allow a person to see to diseased eyes that cause a person to be blind. This is a metaphor referring to spiritual health. Often Jewish people used the phrase "bad eye" to refer to greed. The meaning is: if a person is completely devoted to God and sees things the way God does, then he is doing what is right. If a person is greedy for more, then he is doing what is evil. (See: [[rc://en/ta/man/translate/figs-metaphor]])
This metaphor means the eyes allow a person to see just as a lamp helps a person see in the dark. AT: "Like a lamp, the eye allows you to see things clearly" (See: [[rc://en/ta/man/translate/figs-metaphor]])
"Light" here is a metaphor, comparing clear thinking to a lamp. Inability to think clearly is compared to a lamp that is not lit. AT: "if the understanding that one has is wrong, how wrong one's entire life will be!" (See: [[rc://en/ta/man/translate/figs-metaphor]]).
Both of these phrases mean basically the same thing. They emphasize that a person cannot love and be devoted both to God and money at the same time. (See: [[rc://en/ta/man/translate/figs-parallelism]])