视网膜紫质

例句：

1. 1.The retinal pigment in the eye plays a crucial role in vision.
   眼睛中的视网膜色素在视觉中起着至关重要的作用。
2. 2.The doctor examined the patient's eyes and found that there was a deficiency in the retinal pigment.
   医生检查了病人的眼睛，发现视网膜色素缺乏。
3. 3.Researchers have been trying to develop treatments for age-related macular degeneration by enhancing the retinal pigment.
   研究人员一直在尝试通过增强视网膜色素来开发治疗年龄相关性黄斑变性的治疗方法。