Myopia / Confocal Microscopy / Medically Unexplained Symptoms / Prospective studies / Humans / Female / Male / Astigmatism / American / Clinical Sciences / Middle Aged / Optometry and Ophthalmology / Adult / Public health systems and services research / Time Factors / Human Fibroblasts / Somatic Cell Count / Female / Male / Astigmatism / American / Clinical Sciences / Middle Aged / Optometry and Ophthalmology / Adult / Public health systems and services research / Time Factors / Human Fibroblasts / Somatic Cell Count