二手烟烟雾，正在杀死眼细胞，儿童开始看不清……

Core Viewpoint - Smoking is a significant public health issue that not only affects the lungs and heart but also damages vision, a fact that is not widely recognized [1][8]. Group 1: Impact of Smoking on Vision - A survey indicated that while 76% of adults are aware of the link between smoking and cancer, only 18% know that smoking can harm vision [8]. - Research has shown a correlation between smoking and various eye diseases, particularly age-related macular degeneration (AMD) and cataracts, with significant vision impairment reported among older adults [8][10]. - Chemicals in cigarette smoke, including nearly 7,000 compounds, can lead to oxidative damage to retinal cells, contributing to vision loss [10][12]. Group 2: Mechanisms of Damage - Studies have demonstrated that exposure to cigarette smoke can cause corneal cell death due to the accumulation of iron and the generation of free radicals [12][14]. - Even indirect exposure to secondhand smoke can lead to corneal cell death, highlighting the risks associated with passive smoking [12][14]. - The presence of heavy metals in cigarette smoke, such as cadmium and lead, has been linked to higher concentrations in the lenses of cataract patients [10]. Group 3: Risks to Children and E-Cigarettes - Children exposed to secondhand smoke are at risk of thinner choroids, which can affect their vision health [14][16]. - E-cigarettes have also been associated with increased risks of vision problems, with a study indicating a 34% higher likelihood of vision impairment among e-cigarette users [16][19].