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 is given the prescription which can be fulfilled by any optician. In April 2006, the Scottish Government agreed to the introduction of an enhanced General Ophthalmic Services eye examination, with higher fees. Free NHS sight tests are available to any UK resident and are a thorough examination to check the health of the eyes. Fees for optometrists are £45.00 for a primary eye examination for patients over 60, and £37 for those under 60 and £21.50 a supplementary examination. For the extra money a Scottish optometrist has to be assessed as fit to practice to the higher standard, has restrictions