One eye on center of canvas?

[Michele Rushworth]

Very interesting article.

I suspect it comes down to compositional issues. One eye is usually made the focal point of the painting. For example, when a face is turned somewhat to the viewer's right, the eye on the viewer's left is pretty much directly facing the viewer and many artists choose to make that eye the focal point of the painting. Therefore it gets positioned along that center line.

Just my guess.