around the age of 40 when it becomes increasingly difficult to read details and small print. When sight loss can no longer be fully corrected using glasses, modern vision aids can help you to maintain your

case of the Landolt ring, the gap width is also the same as the thickness of the line. During the sight test, if the person who is being tested can recognise a test symbol that has a line width of less

s, which can be corrected through the use of a vision aid. The visual impairment caused by other sight defects, such as night blindness or amblyopia, cannot be corrected. What is amblyopia? Amblyopia is