There are some people who feel that all Asian eyes are the same. Chinese and Japanese eyes actually have some distinct differences that will make it easier for you to distinguish the race easier. One of the things that you will notice is the shape of your eyes. While oriental eyes have almost the same quality, Chinese eyes tend to droop a bit upwards as compared to Japanese eyes that tend to droop a bit downwards.
A lot of Chinese people do not have double eyelids, while Japanese people may have double eyelids that can make their eyes a little bit bigger. Even if you would look at the features of Japanese and Chinese women, there are also some differences.