I’ve tried out a few different eyes (all blue) but have to say Shaga Realistic Eyes is my favourite so far. I would have happily paid for these since they’re the nicest I’ve had, but you can get them for just 1 linden on the marketplace.
More colours are available for 10L each or 75L for a fatpack of 13. They look terrific, and you can’t beat the price.
On the Markeplace: Shaga Realistic Eyes