Alcohol use, Analgesics, Anthropometry, Antihypertensive drugs, Asthma, Blood glucose, Blood pressure, Blood tests, Body mass index, COPD, Cancers, Cataracts, Cholesterol, Cholesterol tests, Chronic kidney diseases, Corrective lenses, Diabetes, Education, Ethnicity, Eye examinations, Fish, Glaucoma, Glomerular filtration rate, Health literacy, Heart disease, Height, Hemoglobin, Hypertension, Hyperthyroidism, Income, Insulin, Macular degeneration, Marital status, Meat, Migraine, Parkinson's disease, Physical activity, Refraction and accommodation disorders, Stroke, Tobacco smoking, Trachoma, Vegetables, Vision loss, Weight, FFQ