The Amsler grid is designed to evaluate visual field deficiencies in how many degrees of central vision?

The Amsler grid is a useful tool specifically designed for assessing central vision and identifying distortions or deficiencies in the visual field. It typically evaluates the central visual field within a range of about 20 degrees. This makes it an effective method for monitoring conditions such as macular degeneration, where central vision can be affected while peripheral vision remains intact. The grid consists of a series of lines that helps patients report any visual disturbances they perceive, such as blurriness or missing areas. In this context, the correct answer reflects the established range that the Amsler grid is intended to assess, which is pivotal for identifying potential issues with central vision.