Hearing tests are usually performed and a pair of hearing aids, whether programmable or OTC, is recommended regardless of hearing loss in one or both ears. This is the ideal hearing compensation for your ears.
You often say that I only have hearing loss in one ear, so I think I only need to wear one hearing aid. But that will only help you understand the sound coming from one side, such as from a phone or TV.
If you have hearing loss in both ears, wearing two hearing aids will generally provide better results. This can help you better understand sounds coming from both sides, such as from conversations or ambient noise.
Therefore, whether you need to wear two hearing aids depends on the extent of your hearing loss and your needs. It is recommended that you consult a professional audiologist who can give you the best advice for your specific situation.