Red/Green Anaglyph Glasses & Penlight | CI Diagnostic Tools


Red/Green Anaglyph Glasses & Penlight | CI Diagnostic Tools



To readily identify CI, the American Optometric Association (AOA) suggests using the Penlight Red/Green (PLRG) Procedure for Screening for Convergence Insufficiency. We are happy to provide you with a pair of our sturdy Red/Green anaglyph glasses and Penlight, made to fit nearly any patient’s face with our without their ophthalmic lenses.

Product Includes

  • 1 Pair of Red/Green Anaglyph Glasses

  • 1 Reusable Medical Clickable LED Penlight with Pupil Gauge

  • 2 AAA Batteries Included

  • 1 AOA Procedure for Screening for Convergence Insufficiency

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Convergence Insufficiency is a condition in which a patient finds it difficult to maintain alignment of the eyes on a near object. Inability to sustain convergence may cause a person to look with just one eye at a time, or to see double.

The PLRG procedure is a near point of convergence test with good sensitivity that is relatively easy to perform in a short period of time. With the room illumination dimmed, the patient is asked to put on the red/green glasses. If the patient typically wears glasses for near, the red/green glasses are placed over the patient’s eyewear.

The penlight is presented directly in front of the patient at a distance of 24 inches. The penlight is held along the midline and slightly below eye level. Ask the patient “How Many Lights Do You See?” If the patient has normal convergence to that distance, the expected response is “one.” Tell the patient that you are going to slowly move the penlight toward their nose and ask them to report if they ever see two lights instead of one. At some point, while you are slowly moving the penlight inward, the patient should report seeing two colored lights, one red and one green. This is the convergence break point. The penlight is then moved slowly away from the nose until the patient reports seeing one light again.

Repeat this procedure three times and record the convergence break point for the third measurement only. The reason why you repeat the procedure three times is because the Near Point of Convergence tends to recede (move outward) over time due to fatigue, particularly when the patient has convergence insufficiency