Having good skin is very important if you're trying to maintain or even improve your looks.
The theory behind having good skin free of imperfections is also very simple; the difficult part is the implementation of the theory.
Unlike one's dress sense or hairstyle having good skin is usually quite black and white, it's usually better free of lines, wrinkles, acne and blackheads.
There's rarely confusion over what makes 'good' skin because what makes fantastic skin is generally the lack of 'bad' things.
One of the great things about magnified mirrors is that they allow you to have good skin by allowing you to achieve the two things that help gain or maintain great skin; identification and treatment.
Identification with a magnified mirror is simply being able to view what's wrong with your skin more easily.
Now if you have a massive spot on your nose clearly it's not going to help much, but if you have small blackheads or patches of acne they can be a big help.
Treatment using a 10x magnification mirror is also very useful because for most skin ailments you'll be given topical treatments such as crèmes that have to be applied to the surface of the skin.
If applied to undamaged areas these treatments can cause unnecessary damage, which itself may not start alarm bells if you have big enough problems.
But most people don't have a few big problems, they have lots of little problems, and applying an acne medicine that works by drying out the skin to areas without acne can be painful and are wholly unnecessary - with a magnification mirror you can apply treatments much more successfully.