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You have a prima facie case fordisability discrimination assuming you can do the driving job and they are not promoting you into that position because of the perception that your vision issue should prevent you from that. Your race discrimination claim isn't something you could pursue unless the persons they hire into the driving positions also have what they consider disabilities but are not white - if that is the case however, then you also have a prima facie race discrimination case.
I see. Yes then you at the very least have a prima facie case of race discrimination - key to this being if you can show that non-whites are promoted without college degrees. You could file with the EEOC and/or get an attorney to pursue the matter for you.
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