专题07 阅读理解之说明文10篇（第一期）-2023高考英语上海市名校模拟真题速递

2023高考英语上海市名校模拟真题速递 第一期 专题07 阅读理解之说明文10篇 （2022秋·上海浦东新·高三校考一模）We all know that the blue light that emits from our smartphones isn’t good for our eyes, but a new study has discovered just how much damage it can cause. Researchers say that this light is absorbed by vital molecules in our retina (视网膜) and triggers the production of a toxic chemical that kill cells. This damage can lead to large blind spots in our vision that are the hallmark of macular degeneration (黄斑变性), a disease that leads to blindness. The team from die University of Toledo in Ohio says it is urging the public not to use phones in the dark because this can dilate (放大) pupils and lead to even more harmful blue light entering our eyes. Age-related macular degeneration (AMD) is the leading cause of vision loss for those aged 50 or older, according to the National Eye Institute. The condition occurs when the macula, an oval area near the center of Ae retina that allows for sharp vision, becomes damaged. Sufferers will experience blurred vision or even ‘blind spots’ in their central vision that may grow larger as the retina dies. Treatments include medications that stop new blood vessels from forming in the eye as well as laser therapies that destroy abnormal blood vessels.      For this study, the team decided to focus on retinal, a form of vitamin A found in the retina that coverts light into metabolic energy. Photoreceptor cells (感光细胞) use retinal to covert light into signals that are sent to the brain. “The human eye reflects UV light (such as from the sun) very well but it allows blue light to enter and the retinal can absorb blue light very well”, lead author Dr Ajith Kanmaratfme, an assistant professor in the UT department of chemistry and biochemistry, told Daily Mail Online. Dr Karunarathne noted that blue light alone or retinal that hadn’t absorbed blue light did not have any effect on the cells. He added that there was no activity when retinal was exposed to other light colors such as green,