Binocular Vision Assessment Instruments

What is stereopsis primarily defined as?

• The ability to see colors accurately.

• The ability to perceive depth based on retinal disparity.

• The ability to focus on objects at different distances.

• The ability to see clearly with one eye.

Stereoacuity is typically measured in which units?

• Diopters

• Millimeters

• Seconds of arc (arcsec)

• Prism diopters

Which type of stereogram presents patterns of random dots where the target is hidden within the noise, requiring true global stereopsis?

• Contour Stereograms

• Random Dot Stereograms (RDS)

• Anaglyph Stereograms

• Lenticular Stereograms

Which stereopsis test is need to be used with polaroid glasses?

• Titmus Fly Stereotest

• Frisby Stereotest

• Lang Stereotest

• TNO

A patient with excellent stereopsis would typically have a stereoacuity value that is:

• Very high (e.g., 3000 arcsec)

• Around 400 arcsec

• Very low (e.g., 20 arcsec)

• Not measurable

The Worth 4-Dot Test is used to assess a patient's type of binocular vision response, which includes:

• Refractive error, astigmatism, and presbyopia.

• Fusion, suppression, or diplopia.

• Visual acuity, color vision, and contrast sensitivity.

• Ocular motility, pupillary reflexes, and intraocular pressure.

In the Worth 4-Dot Test, if a patient sees only 2 or 3 lights, it indicates:

• Fusion

• Diplopia

• Suppression

• Anomalous Retinal Correspondence

If a patient sees 5 lights during the Worth 4-Dot Test, it indicates:

• Fusion

• Diplopia

• Suppression

• Normal binocular vision

What type of glasses are typically worn by the patient during the Worth 4-Dot Test?

• Polarized glasses

• Red/green glasses

• Trial frame lenses

• Pinhole glasses

A primary advantage of the Worth 4-Dot Test is that it is:

• Quantitative and provides an angle of deviation.

• Highly objective and automated.

• Simple, quick, and provides clear information on fusion/suppression.

• Not affected by color perception deficiencies.