Tainted, there could be several causes of your hamster's diminished vision (or whatever little poor vision they have to begin with).
Physical trauma is one, as it brain damage (they are so hyper that sometimes, falls may induce brain or CNS damage), but sometime likely with hamsters of your breed is diabetes.
The Russian White, if it is a pure Russian white, may still have ancestry from the Campbells, and therefore require specific dietary needs lower in mono saccharides, or simple sugars. Also, some owners may unknowingly feed treats that may be high in sugars without ever knowing it.
Have you been feeding your Hamster a specifically formulated Hamster food for the Russian Dwarf Whites all this while, and what treats do you normally give her?
Due to the difficulties in sometimes identifying the two breeds, it's not uncommon that a lot of pet stores breed indiscriminately (not that they care even if they knew), so your Russian White may not be a pure Russian White, but a hybrid. Hybrids are known to be pre-disposed to health and birthing problems.
Without getting too much into technicalities, because I would have to in order to explain it further, and also because my experience with hamsters is very, very limited, I would suggest you approach the vet to discuss the possibilities:
1) Could there have been any physical trauma?
2) Are there any signs of shock, neuro or CNS injury (chances are the vet would have to very carefully observe the hamster's movements and physical reactions)
or if #1 and #2 are ruled out very specifically,
3) What are the chances of your hamster having Diabetes?
For #3, usually a very quick and simple blood test (pin prick, don't worry) and an instant glucometer reading should reveal enough information.
Of course, you shouldn't rule out infection nor retinal atrophy, although I've not actually seen a case of the latter before in a hamster.
I would check with the vet receptionist first, if the vet you intend to go to is familiar with diagnosing and treating hamsters. Most vets have very little or only cursory experience with such animals. Most importantly is their ability to detect any signs of neuro/CNS problems, as well as be familiar/have references of blood works readings for hamsters on hand. I'm not sure if any treatment for diabetes in Hamsters exist, or are available here in SG.
I hope this information helps some. I'm sorry I'm not that familiar with Hamsters dear.