What is Binocular Vision? Binocular vision has two components; ocular alignment and stereo acuity. Screening binocularity determines how well the two eyes function together.

The purpose of screening binocular vision/stereovision is to determine if the child has adequate binocularity.

Equipment

• Random Dot E (RDE) Stereo test Kit
• Anti-bacterial wipes

RDE Kit Includes:

• Model E slide—demonstration plate with a large, embossed letter “E” used for training purposes only.
• Stereo Blank slide—used for training and screening; contains an array of randomly oriented dots; no “E” appears even with the stereo glasses in place.
• Raised/Recessed E slide—used for screening purposes only; contains an array of randomly oriented dots; when stereo glasses are worn, a large letter “E” appears if the child has normal binocular vision.
• Stereo sunglasses

Procedure

Administering The Test:

1. Show the child the Model E slide. Be sure that the child can identify the “E”.
2. Place the stereo glasses on the child. Do not remove prescription glasses if the child wears them.
3. If the stereo glasses are too large for the child, put a short piece of masking tape on the top of the glasses and use the other end of the tape to hold the glasses on the child’s forehead.
4. Be sure that the child keeps his/her head straight up when viewing the slides. Tilting to one side or allowing the glasses to tilt on the nose will interfere with the test.
5. Show the child the Model E slide and the Stereo Blank slide. Slightly rotate, without tilting the slides to give optimal viewing.
6. Have the child point to the slide with the “E”.
7. Practice by mixing up the Model E slide and the Stereo Blank slide behind your back and presenting the slides to the child until you feel the child understands.

Screening Session

1. Replace the Model E slide with the Raised/Recessed Stereo E slide.
2. Hold the slides 40” from the child at eye level.
3. Have the child identify the slide with the “E” on it.
4. Continue mixing up the cards behind your back and have the child identify the “E” slide. 5. Repeat this process 5 times.

Referral Criteria

For a pass, the child must locate the Stereo “E” card at least four out of five presentations.

Note: A child who is uncooperative or unable to complete the screening should be referred