What does the phrase mean not too hard on eye?

The phrase "not too hard on the eye" is a colloquial way of saying something is visually appealing or pleasing. It means that something is easy to look at and doesn't strain your eyes.

Here are some examples of how it can be used:

* "The new paint color is not too hard on the eye. It's very calming."

* "I like the design of the website. It's not too hard on the eye."

* "The new dress is not too hard on the eye. It looks great on her."

Essentially, it's a way of saying something is visually comfortable and doesn't cause any discomfort or strain.