What is the least important thing that you have ever worried about? One time, when I was 40 I bought the most amazing pair of reading glasses perfectly designed by brilliant Parisian ophthalmologists. They cost me around a thousand dollars, thin, gold rimmed, very well styled, perfect... and they dimmed in the sunshine, they cleared in the dark, they were good for reading and driving and writing, and I had them for a day and then lost them in Paris...I was never so much worried about the cost of such basically unnecessary things, I was just more worried that I had paid so much for something inessential. Never been back to the optometrists since. The world looks just fine to me anyway. I can see enough for my needs.