Eye chart smaller towards the bottom of the chart. The person removes any glasses or contact lenses, and stands or sits a standardized distance from the chart (e.g., 20 feet for the Snellen chart). The person is then asked to identify the optotypes on the chart, starting with large rows and continuing to smaller rows until the optotypes cannot be reliably identified any more. The row in which the person can reliably identify symbols defines the visual acuity. One eye is tested at a time. Practically, this is accomplished by covering the other eye with a hand, piece of paper, or a
Eye care in the United Kingdom eye examinations, and an estimated 1,900 of people were likely to have had their condition remedied. In Wales the entitlement to sight tests is similar to that in England, except that most optometrists can also offer a free eye test to people who: People qualify for help with the cost of glasses or contact lenses if they are: Qualifying people get an NHS optical voucher, the value of which depends on their prescription. The voucher can be cashed with any supplier who accepts NHS optical vouchers. Between 1948 and 1985 the NHS supplied spectacle frames. In 1949 there were ten