Actual Centre vs. Optical Centre

One of those “design things” that you might not realise is a thing, but can bother your eyes: actual centre versus optical centre.

What am I talking about? When an image, a heading – anything visual – is centered perfectly on a page, our eyes don’t agree. It may feel like the image is lower than it should be. If you let your computer do the centering for you, it will make it perfect centre, but it won’t look perfect. It’s also called the mathematical centre or geometrical centre.

So what position makes our eyes happy? It’s called optical centre, and it’s just slightly above the actual centre, and slightly to the right. It’s ever so slight that you won’t notice it’s not mathematically correct – but it makes all the difference. Our brains process images that are placed in the optical centre much more positively; it’s comfortable for our eyes.

Just one of those little random design tricks for you today!