Wearing your bifocals, position the grid about 14" away. Focusing on the dot in the center of the grid, with one eye covered, ask yourself the following questions:
• Am I able to see the corners and sides of the square?
• Do I see any wavy lines?
• Are there any holes or missing areas?
If the lines of the grid do not look straight or areas appear to be missing or distorted, you should inform a retinal specialist.