Retina/ˈretɪnə/ Definition 1 of 2Pro Tip 1/3Vision Essential The retina is vital for vision, converting light into brain signals. A healthy retina is crucial for good eyesight. Pro Tip 2/3Not Just Tissue Retina refers to complex eye tissue, not a simple one. The retina contains layers of cells, not just one type. Pro Tip 3/3Medical Concerns Retina problems can lead to vision loss, indicating serious health issues. Retinal damage can cause irreversible blindness.