The document discusses various potential therapies for retinal cell loss, including stem cell-based therapies. It describes how induced pluripotent stem cells can be derived from a patient's own skin cells and differentiated into retinal cells for transplantation without risk of rejection. Studies in mice found that transplanting embryonic stem cell-derived retinal cells improved electroretinography responses and histology compared to controls. The potential for stem cell therapies to treat retinal degeneration by replacing lost cells is discussed.