How to Test for Convergence Insufficiency

Convergence insufficiency is a common visual problem wherein a person's eyes don't work as well when looking closely at objects. It can cause blurred vision, double vision and headaches. It is caused by the eyes drifting outward when the person is focusing on something near. It is often not diagnosed because it is not part of standard visual screening. There is a test for it, though, and you can test for convergence insufficiency at home.

Things You'll Need

• Ruler

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Instructions

• 1

  Cut an 8 1/2 x 11 inch sheet of paper into a rectangular shape. Use a ruler to measure a rectangle that is 7 inches by 5 inches. Draw lines with a pen pencil so you know where to cut. The lines must be even before you cut.

• 2

  Draw a vertical line down the middle of the paper. The line should be about 1/8 inch thick.

• 3

  Hold the piece of paper in front of you with the lined side facing you. Fully extend your arm and move your forearm in the appropriate direction until the line is centered between both eyes.

• 4

  Slowly bring the paper toward you, staring directly at the line. Keep the paper centered and level to your eyes. Stop when you experience double vision.

• 5

  Measure the space between the bridge of your nose and the piece of paper. If the paper is more than two inches away, there is a strong likelihood that you have convergence insufficiency.