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

The Amsler grid is specifically designed to assess the central visual field, focusing on a region of approximately 20 degrees of central vision. This tool is primarily used to detect distortions or changes in the central vision, which may indicate conditions like macular degeneration or other retinal issues. By monitoring how straight lines appear on the grid, healthcare professionals can identify areas of visual distortion or scotomas, which are blind spots in the central vision. The design of the Amsler grid allows it to be a practical and effective method for evaluating these specific central vision deficiencies.