The Fujian Eye Study examined the prevalence of uncorrected presbyopia (difficulty seeing near) in adults over 50 years of age in Southeast China.[1][4] Out of a total of 8,033 participants, 68.6% had uncorrected presbyopia.[6] Researchers found that presbyopia was more strongly associated with older age, less education, lower income, higher intraocular pressure, and certain refractive errors of the eye.[4] Conversely, gender, weight, blood pressure, time spent outdoors, cell phone use, history of hypertension, hyperlipidemia, smoking, alcohol and tea consumption, and degree of urbanization (urban versus rural) had no independent effect on the incidence of presbyopia.[4] Although age was a significant factor, its ability to differentiate presbyopia in an individual was limited in this age-homogeneous group.[4]