Snellen chart H, K, O, S, 3, U, Y, A, C, E, G, L, 2. The normal Snellen chart is printed with eleven lines of block letters. The first line consists of one very large letter, which may be one of several letters, for example E, H, or N. Subsequent rows have increasing numbers of letters that decrease in size. A person taking the test covers one eye from 6 metres or 20 feet away, and reads aloud the letters of each row, beginning at the top. The smallest row that can be read accurately indicates the visual acuity in that specific
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