1. The patient should wear Polaroid glasses over his or her appropriate prescription.

2. The plates should be well illuminated, glare free, and upright to ensure proper axis of polarization. Do not allow the patient to do any head tilting or turning.

1. The test plates are presented in order, at 40 cm.

2. The plates should be well illuminated, glare free, and upright to ensure proper axis of polarization. Do not allow the patient to do any head tilting or turning.

3. Present plate 1 (random dot stereo target) and say, “Do you see any pictures in these boxes? Tell me what you see.”

4. The examiner may ask the patient to identify the box in plate 1 with no form in it, or may ask a young patient to point to the matching figure on the instruction card.

5. Present plate 2 (similar to Titmus animals) and say, “There is a rabbit, a cat, a squirrel, a monkey, and a chicken [point to row A]. Does one of those animals look closer to you than any of the other animals or float or come out of the page?”

6. Repeat for rows B and C.

7. Present the third plate. Similar to Wirt circles, say, “Look at box number 1. There are three circles in the box. Do any of the circles come out of the page toward you (or float out) or do they look like they are flat on the page? Which one? Left, middle, or right?” Young children are encouraged to “push the magic button or door bell that is popping out.”

8. If no stereopsis is noted, point to the correct answer and one alongside it for comparison. Ask if either one “pops out.”

9. The same procedure is carried out for each of the 10 boxes.

10. Stop when the patient cannot identify (or incorrectly identifies) two in a row. If the patient misses one but can continue through with correct responses, recheck the one missed.

11. Reliability can be checked by inverting the test booklet. The “floating” forms will be seen as recessed.

1. Hold target at 40 cm.

2. Book should be well illuminated, glare free, and upright to ensure proper axis of polarization.

3. Do not allow the patient to do any head tilting or turning.

1. The patient should be wearing red/green glasses and distance correction in place.

2. Hold the Worth four-dot flashlight at 33 cm.

1. Cover the patient’s left eye and ask, “How many lights do you see?”

2. Now cover the left eye and ask, “How many lights do you see?”

3. Now with both eyes open ask, “How many lights do you see?”

4. Repeat step 3 at 1 m.

1. It is not necessary to ask about the color of the lights. Simply ask how many lights are seen with the right eye, left eye, and both eyes.

2. It is important to perform the test at 33 cm and 1 m.

1. Ambient and overhead lighting should provide good illumination.

2. The 20/30 single letter on the Gulden fixation stick is used as the target.

3. The examiner should hold the target very close to the eye to begin the test.

4. If the patient wears glasses, these should be used.

5. Occlude the patient’s left eye.

1. To begin the test, slowly move the target away from the patient’s eye at approximately 1 to 2 cm/sec.

2. The target will be moved away from the subject until the subject can just report the letter on the stick. This will be considered the endpoint.

3. Measure the distance from the eye to the stick.

4. The accommodative amplitude will be measured to the nearest centimeter.

1. Patient is seated comfortably behind the phoropter viewing through his or her distance prescription.

2. A well-illuminated near target (one line of letters larger than the patient’s near visual acuity) is set at 40 cm.

3. Testing is done monocularly only.