http://www.houstonent.com/hearing-aids-two-are-better-than-one/
Hearing Aids: Two Are Better Than One
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In most cases, it's better to have two hearing aids rather than one. Wearing two hearing aids allows more information to reach your brain, and makes it easier to hear speech against background noise. With two hearing aids, you will enjoy more balanced hearing, and you will be more able to tell where a sound is coming from. In much the same way you would wear two corrective eyeglass lenses to treat a vision problem, it makes sense to fully address hearing loss in both ears, with two hearing aids. Talk to your doctor or hearing professional about your options.