Depth perception tests evaluate stereopsis, the ability to judge relative distances using binocular vision. Good stereopsis depends on proper eye alignment and similar image quality in both eyes.
Common tests
Several clinical tools assess stereoacuity.
- Titmus fly, Randot, or Frisby tests using random-dot or contour stereograms
- Patients wear special glasses and identify raised or hidden shapes
- Results are recorded in seconds of arc, indicating stereoacuity threshold
- Simple functional tests, such as catching a ball, also reflect depth perception
Clinical relevance
Reduced stereopsis has practical implications.
- Common in strabismus, anisometropia, or amblyopia
- May affect tasks requiring fine depth judgement, such as sports or certain jobs
- Improvement is possible with early treatment of underlying causes
- Helps guide decisions about surgery and measure outcomes
