Usually most people who follow the custom of putting on shades have weird eyes. And the moment they open their eyes you’d be surprised how they look like. For some other reasons this clan seems to like keeping what makes up their eyes a secret from people. Basically these guys body is made up entirely of insects, so what’s the catch here?
Its very likely that they have unusual looking eyes. They probably have insects characteristics. We have lots of different types of eyes in Naruto. And probably the Aburame’s clan could be part of them. And might play an important role when communicating with their insects. Due to this they might be similar to that of most insects. To which the clans custom would be to keep such eyes behind shades.
The clan has many secret jutsu and practices that universally deals with bugs insects. And most probably the clan’s eyes could be possessing specialised techniques and function such that exposure to bright lights affects them negatively. I mean amongst characters from Naruto, they are the ones with such a habit, or rather a practice by the way. So for these guys, there’s always more that meets the shades xD.
This all from me guys, we will be meeting soon with more news and theories. And don’t forget, the comments section is always open for your ideas and views.