Legal Question in Workers Comp in Maryland

You can't sue Walmart or a fellow employee, but you can file a worker's comp claim for any loss of wages or permanent injury. It sounds like you regained your sight quickly, thankfully. If there was an independent company responsible for loading the chemicals on the truck and they did so negligently, and that's the reason you were exposed, you could theoretically sue them, but fortunately your damages were minimal, assuming you've regained full eyesight.