Vision – Stereo Test and Visual Field

Stereo tests are eye tests that assess an individual’s ability to see in 3D, also known as stereopsis. Stereopsis is the brain’s ability to combine two images of the same object, each seen by one eye, into a single 3D image. This gives us depth perception and helps us measure objects and estimate distances.

Types of stereo tests

There are different types of stereo tests, including:

• Rand dot stereopsis tests: These tests use images with patterns that create an illusion of depth when viewed by both eyes. People with normal stereopsis will be able to see the 3D shape, while people with limited or no stereopsis will see the image flat.
• Polarized stereo tests: These tests use special glasses with polarized lenses to present two different images to each eye. The brain then combines these images into a single 3D image.
• Anaglyph stereo tests: These tests use images with red and blue filters. The tester wears special red-blue glasses which allow the brain to combine the two images into a single 3D image.

Purpose of stereo tests

Stereo tests are used for a variety of purposes, including:

• Assessing the development of binocular vision in children: Stereopsis develops in early childhood. Stereo tests can be used to check if the development of binocular vision is proceeding normally.
• Diagnosing vision problems: Stereo tests can be used to diagnose a variety of vision problems, such as strabismus (crossed eyes), amblyopia (lazy eye), and diplopia (double vision).
• Assessing binocular vision function: Stereo tests can be used to assess binocular vision function, which is important for tasks that require depth perception, such as driving, playing sports, and 3D work.