Astigmatism Fan Test
A clear visual check for refractive error (Astigmatism).
How to Perform the Test
- Stand back: Position yourself about 1-2 meters (3-6 feet) from the screen.
- Cover one eye: Cover one eye completely with your hand.
- Focus: Look directly at the red center point of the fan.
- Observe: If you have astigmatism, one or two lines will appear much sharper and darker than the others.
- Note the Axis: The sharpest and darkest line indicates the approximate axis (direction) of your astigmatism.
- Repeat: Repeat the test with the other eye covered.