Depth perception is the ability to judge how far away objects are and how they relate to each other in space. It relies on both eyes working together as well as other visual cues.
How the eyes create depth
Binocular vision is central.
- Each eye views the world from a slightly different angle
- The brain combines these images to produce stereopsis, a sense of 3‑D depth
- Clues such as size, overlap, and motion also help when one eye is weaker
- Tests in clinic can measure stereoacuity in seconds of arc
Why depth perception matters
Reduced depth perception can affect daily tasks.
- Common in strabismus, amblyopia, or significant difference between the eyes
- May impact driving, ball sports, and some occupations
- Early detection in children allows treatment of underlying problems
- Adults with reduced stereopsis may learn to rely more on monocular cues
