Eye chart smaller symbols until the person cannot identify the symbols. The smallest symbols that can be reliably identified is considered the person's visual acuity. The Snellen chart is the most widely used. Alternative types of eye charts include the logMAR chart, Landolt C, E chart, Lea test, Golovin–Sivtsev table, the Rosenbaum chart, and the Jaeger chart. Charts display several rows of optotypes, which are standardized symbols for testing vision. Optotypes are usually letters, numbers, or geometric symbols. Each row of the chart depicts optotypes of a different size. Typically the largest optotypes are in the top row. The optotypes become progressively
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