Modified Sheridan–Gardiner vision test with a semitransparent card

Editor,—Testing visual acuity in children can be difficult, largely because of their lack of knowledge of the alphabet. Their short attention span and poor cooperation also contribute. The Sheridan–Gardiner method is a very useful and widely used for testing vision in children, especially preschool children and those with learning difficulty. The examiner shows letters of different sizes (corresponding to different levels of Snellen acuity) from a distance of 6 metres, …