市面上提供的老花镜品种很多,选购时宜根据自己的需要和经济条件作出选择。单光镜优点:整个镜片的每一点看近距离景物相当清晰。缺点:戴眼镜后只能看近,抬头远望则视野模糊。适合有阅读习惯或经常看近的人士。双光镜优点:这种镜片能同时照顾远近视野,用途全面又容易适应。缺点: Reading glasses available on the market a lot of variety, when the purchase should be based on their needs and economic conditions to make a choice. Single-lens advantages: Every point of the lens to see close-range scenery is quite clear. Disadvantages: After wearing glasses can only see near, looking up, the vision is blurred. Suitable for reading habits or people who often visit. Bifocal lens advantages: This lens can take care of distance vision, comprehensive and easy to adapt. Disadvantages: