Recessive genes. First of all you must understand that eye colour isn't one gene but in fact many genes, I believe it was 13 or something like that. These genes have different prevalence among all ethnic groups and will dictate what type of light colours you might get.
I have not studied deep enough to know how prevalent these eye colour genes are in asian populations, but in Europe for example you will see Scandinavians have the "bluest", and it slowly dilutes the further south and east you go until its mostly brown, but even then the brown colour of say Spaniards or Greeks will be different from a Chinese or African, it's just very hard to tell nuances between brown colours. We know Indians have a quite wide genetic diversity, and some Indians are known to have light eyes. This would most likely mean there are recessive eye colour genes in many Indian people, and there is always a chance when pairing that the child might get the odds to get a lot of the light colouring genes. It is not at all uncommon for people in Scandinavia to have one parent with brown eyes give birth to a child with light eyes, I hope my explanation was sufficient enough. The only different thing is what type of eyes will emerge and the likelyhood of light eyes.
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