why are the bifocal eyeglasses so popular?

Why are the bifocal eyeglasses so popular? This is what I asked the service personnel in an optical store a month ago. Now I have known the answer after I brought one pair of bifocal eyeglasses. The bifocal eyeglasses really brought me more than clearer eyesight. It also provided me a good mood. This story should start from my retirement.
I am 60 years old and have just retired from one local institution a month ago. As planned, I moved to the south of the country to find some new interesting things that I have been longing for. There were too many items I thought necessary to take that I simply forgot my eyeglasses. On arrival in California, I suddenly recognized the importance of my eyeglasses. Without the old eyeglasses, I cannot read the daily newspaper clearly, let alone the TV program. For over one week, I just listened to the radio. Having made everything in order, I decided to buy myself a new pair of eyeglasses in the strange city. However, my daughter suggested me that I had better choose some new styles online.
I admitted her idea and logged online. In the option shop she has recommended, I told the service personnel that I was in need of a pair of new eyeglasses. He asked me about my age and eyesight then advised me a pair of bifocal eyeglasses. As he said, the bifocal eyeglasses were popular. Why were the bifocal eyeglasses so popular? I asked. He told me many tips. Firstly, many old people have difficulty in reading both small characterized letters and the things in the distance. The bifocal eyeglasses can be used to see almost all the things clearly in these two circumstances. This has eliminated the trouble to change eyeglasses from time to time. At the same time, the bifocal eyeglasses cost less because it can act as two pairs. Last but not least, the bifocal eyeglasses have no invisible lines in the middle lens. As a result, it won’t cause dizzy feeling on people who wear it.
Finally, I took the advice of the service personnel and ordered the bifocal eyeglasses. Now I felt new and fresh with the bifocal eyeglasses. It made the scene in front of me very clear and thus brought me a happier mood. My daughter also thought that the bifocal eyeglasses were suitable for me.
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