延缓眼部衰老：三十岁以后要补眼营养

转载39健康网眼睛是心灵的窗户，眼部健康问题一直受到医学界和营养界的广泛关注。6月6日是世界爱眼日，由美国知名膳食营养补充剂品牌“自然之宝”发起的“营养与眼健康科普座谈会”在京举行，就如何从营养的角度保障眼部健康、防止不良用眼习惯对眼睛的伤害等问题进行了深入探讨。

据专家介绍，叶黄素是一种对眼部视网膜健康有着重要作用的营养素，为类胡萝卜素家族(一组植物中发现的天然的脂溶性色素)的一员，与玉米黄素同为人眼视网膜黄斑区域的主要色素。人类的眼睛含有高量的叶黄素，这种元素是人体无法制造的，必须靠摄入叶黄素来补充。1988年哈佛大学研究发现，人类视网膜中叶黄素浓度越高，视觉敏感度越强。1990年英国皇家老年性视网膜黄斑变性视力研究报告指出，叶黄素的抗氧化作用能保护视网膜，防止年龄相关性眼部黄斑病变(amd)的发生。

而在最近召开的“植物化学物及膳食补充剂的研究进展高层论坛”上，美国著名营养学家菲利普•多梅尼科(philip domenico)在一份报告中指出，由于现代生活方式的影响，10年后将有超过4000多万的美国人视力受损，而全世界视力受损人群将超过2.85亿。这主要是由于太阳光中大量的紫外线及蓝光进入眼睛，紫外线一般能被眼角膜及晶状体过滤掉，但蓝光却可穿透眼球直达视网膜使眼部受损，而黄斑中的叶黄素则能过滤掉蓝光，减轻蓝光对眼睛的损害。另外，现代生活方式导致眼睛长期疲劳，这些都会加速眼睛的衰老。白内障、老年黄斑区退化都与黄斑区色素缺少有着直接的关系，缺少黄色色素，还会增加罹患眼睛退行性病变的风险，而如果及时补充叶黄素，全世界85%的视力损伤和75%的失明风险将被阻止。

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