Depth perception testing evaluates how well a person can judge relative distances between objects in three-dimensional space. It relies on binocular cues such as stereopsis as well as monocular cues.
Methods
Tests may involve recognising raised or recessed patterns, aligning objects at different distances, or performing stereo tests that require binocular fusion. Some assessments use real objects, while others use printed or computer-based stimuli.
- Often performed with the patient wearing their usual correction
- May include tasks like matching the height of rods or judging which object is nearer
- Performance can be quantified in terms of depth thresholds
- Monocular tests can help distinguish binocular from non-binocular contributions
Clinical Use
Depth perception testing is helpful in evaluating strabismus, amblyopia, and suitability for specific occupations or activities. It also assists in rehabilitation planning after loss of binocular vision.
- Reduced depth perception may affect driving, sports, and fine manual tasks
- Results guide advice on safety and adaptation strategies
- Changes can track improvement after strabismus treatment
- Interpretation takes account of underlying visual acuity and field defects
