Category: Knowledge Center

Depth perception – or stereopsis – is how a person judges how far away an object is from him/her, combining such factors as the apparent size of the object, its apparent rate of motion, the object’s height in the field of vision, the image’s clarity and various shadows. Related items Van Orden Graph Training Charts...

Diplopia is commonly known as “double vision,” when a person sees two images of an object instead of one. Binocular diplopia – double vision in both eyes – is caused by a misalignment of the eyes and is often treated with vision therapy. Monocular diplopia – double vision in only one eye – can be...

Esophoria – commonly referred to as “being cross-eyed” or underconvergence – occurs when the two eyes do not aim simultaneously at the same object and instead point in different directions – in this case inward. Esophoria impacts binocular vision – the ability of both eyes to work together – and depth perception. Related items Transparent...

Exophoria – commonly referred to as “being wall-eyed” or Overconvergence – occurs when the two eyes do not aim simultaneously at the same object and instead point in different directions – in this case outward. Esophoria impacts binocular vision – the ability of both eyes to work together – and depth perception. Related items Closed...

The Farnsworth-Munsell 100 Hue Test gauges color discrimination among 100 different colors and screens for color blindness.

Farsightedness – or hyperopia – occurs when light rays focus behind a person’s retina, as opposed to directly on it. A farsighted person can see distant objects clearly but has difficulty seeing objects close by. Related items Correct-Eye Scope Far Point Snellen Letter Acuity Test Far Point Landolt Ring Acuity Test Rapid Screening Tests for...

Fusion is the term that defines how well both eyes work together to combine the images each see into one clear, coherent joined image. Related items Correct-Eye Scope The Basic Franzblau Multi Sensory Coordinator Pedestal-Mount Open Stereoscope Pedestal-Mount Closed Stereoscope Sherman TV Training Kit Sherman Vision Therapy Playing Cards Gross Stereopsis Test DC Aviators Test...

A Gesell test is a learning and skills development test that compares a child’s observed behaviors to what is considered “normal” for his/her chronological age. Vision testing is an important part of a Gesell test.

The Groffman Program is a developmentally-focused form of vision therapy that uses visual tracing to reduce suppression and enhance fusion and hand eye coordination. It follows the concepts of programmed learning. Related items Groffman Visual Training Program Book 1 Groffman Visual Training Program Book 2 Two (2) Groffman Test Cards, One (1) Demonstration Card

Hand-eye coordination is the degree to which visual and manual functions work together at near, intermediate and far distances. Related items The Basic Franzblau Multi Sensory Coordinator AN Training Series Combined Base-In/Base-Out Training Unit and Pointer Method Leavell Exercise Pads for the Correct Eye Scope Leavell Exercise Pads (AA,BB,CC) for the Stereo Reader Zweig-Bruno Exercise...