pigmentary degeneration of retina

例句：

1. 1.The patient's vision gradually worsened, and eventually, he had to rely on a wheelchair.
   患者的视力逐渐恶化，最终不得不依赖轮椅。
2. 2. This disease is characterized by the progressive loss of vision in the retina.
   这种疾病的特点是视网膜逐渐丧失视力。
3. 3. The patient was diagnosed with retinal pigmentary degeneration, which can lead to severe visual impairment.
   患者被诊断出患有视网膜色素变性，这可能导致严重的视觉障碍。