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Visual Agnosia01:12

Visual Agnosia

Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round end"...

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Related Experiment Video

Updated: Jun 22, 2026

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision
09:29

A Standardized Obstacle Course for Assessment of Visual Function in Ultra Low Vision and Artificial Vision

Published on: February 11, 2014

Paper tools for assessing visual function.

Maureen K Powers1

  • 1Research Institute, Gemstone Foundation, Rodeo, California 94572, USA. maureenpowers@gemstonefoundation.org

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|June 2, 2009
PubMed
Summary
This summary is machine-generated.

This study reviews four simple, paper-based functional vision tests: Amsler Grid, Pelli-Robson Contrast Sensitivity Chart, Teller Acuity Cards, and Developmental Eye Movement Test. These tools are easy to use, rigorously designed, and beneficial for children

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Area of Science:

  • Vision science
  • Ophthalmology
  • Optometry
  • Public Health

Background:

  • Functional vision tests are essential tools in various health and educational fields.
  • Translating laboratory findings into practical clinical tools requires careful consideration of design and usability.
  • The development process of clinical vision assessment tools can be complex.

Purpose of the Study:

  • To review four established, paper-based functional vision tests.
  • To highlight the development process and commonalities among these tools.
  • To encourage the creation of new, clinically useful paper-based vision assessments.

Main Methods:

  • Review of four functional vision tests: Amsler Grid, Pelli-Robson Contrast Sensitivity Chart, Teller Acuity Cards, and Developmental Eye Movement Test.
  • Analysis of the development process for each tool.
  • Examination of ease of use and design rigor.

Main Results:

  • The Amsler Grid, Pelli-Robson Contrast Sensitivity Chart, Teller Acuity Cards, and Developmental Eye Movement Test are effective, easy-to-use paper tools.
  • These tests share common developmental pathways and design principles.
  • All reviewed tests are suitable for or have potential use with pediatric populations.

Conclusions:

  • Simple, rigorously designed paper tools are valuable for assessing functional vision.
  • Further development of existing assessments and translation of research into practical tools is encouraged.
  • Scientists and clinicians should consider creating accessible, paper-based vision assessment solutions.