Each year thousands of international students apply for U.S. student visas, and the vast majority of them are denied. Unsuccessful applicants are quick to speculate about a myriad of different reasons why their application got rejected. Never ever is your visa application rejected because of your low GRE scores.
There are several legitimate reasons whereby your student visa can get denied, but your GRE score is not one of them. Graduate schools use your GRE score to determine if you make a good candidate for their school or not. Outside of that, your GRE score is irrelevant to the visa process. However, before you can apply for a U.S. student visa, you need to prove that you have been admitted to a grad school. If your low GRE score prevents you from getting into grad school, then the visa process won’t even start.