As we age, many adults experience presbyopia, which is the loss of visual acuity for objects closest to you. Presbyopia tends to affect individuals over the age of 40, and according to the Mayo Clinic, the condition might worsen until it halts at the age of 65. Depending on your vision, you might choose one of three options, either progressive lenses, reading glasses, or bifocals. There are approximately two million online eyeglass and frame purchases made each year in the United States, according to a 2012 Vision Council Internet Influence Report. If you are shopping for glasses online, here is…