Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Visual Agnosia

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...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Laser speckle contrast imaging detects relative blood flow reduction in traumatic optic neuropathy.

American journal of ophthalmology case reports·2025

Same author

Outer Lamellar Macular Microhole in a Patient With Papilledema.

Journal of neuro-ophthalmology : the official journal of the North American Neuro-Ophthalmology Society·2024

Same author

Objective Resident Characteristics Associated with Performance on the Ophthalmic Knowledge Assessment Program Examination.

Journal of academic ophthalmology (2017)·2023

Same author

Outcomes and Complications in Patients With Hypermobile Ehlers-Danlos Syndrome Who Have Undergone Laser In Situ Keratomileusis Surgery.

Cornea·2022

Same author

Post-traumatic headaches and vision: A review.

NeuroRehabilitation·2022

Same author

Parent-provided photographs as an outcome measure for childhood chalazia.

Journal of AAPOS : the official publication of the American Association for Pediatric Ophthalmology and Strabismus·2022

Same journal

Editorial.

The American orthoptic journal·2017

Same journal

Editorial.

The American orthoptic journal·2017

Same journal

Editorial.

The American orthoptic journal·2017

Same journal

Congenital Cranial Dysinnervation Disorders: A Literature Review.

The American orthoptic journal·2017

Same journal

Alfred Bielschowsky, 1871-1940: Ophthalmologist, Innovative Scientist, and Influential Teacher.

The American orthoptic journal·2017

Same journal

Early Onset Sixth-Nerve Palsy with Eccentric Fixation.

The American orthoptic journal·2017

See all related articles

Search research articles

Related Experiment Video

Updated: Mar 30, 2026

Author Spotlight: An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System

Author Spotlight: An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System

Published on: March 17, 2023

Comparing Visual Acuity Measured by Lea Symbols and Patti Pics.

Eric L Singman¹, Noelle S Matta², Jing Tian³

¹From the Wilmer Eye Institute, Johns Hopkins University, Baltimore, Maryland;

The American Orthoptic Journal

|November 14, 2015

Summary

This summary is machine-generated.

This study found that Patti Pics eye charts provide similar visual acuity measurements to well-validated Lea Symbols charts in both children and adults. The charts showed comparable results across various age groups and visual acuities.

Keywords:

Lea Symbols®Patti Pics®pediatric ophthalmology pediatric vision screening visual acuity

More Related Videos

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Published on: February 23, 2024

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia

Published on: September 27, 2024

Related Experiment Videos

Last Updated: Mar 30, 2026

Author Spotlight: An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System

Author Spotlight: An Automated Method for Assessing Visual Acuity in Infants and Toddlers Using an Eye-Tracking System

Published on: March 17, 2023

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Published on: February 23, 2024

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia

Comparison of Three Clinical Stereoscopic Methods for Measuring Binocular Visual Function During Amblyopic Treatment in Unilateral Amblyopia

Published on: September 27, 2024

Area of Science:

Ophthalmology
Optometry
Vision Science

Background:

Limited validation data exists for many illiterate eye charts.
Lea Symbols® charts are well-validated in numerous studies.
This study compares two ETDRS-style charts: Lea Symbols® and Patti Pics®.

Purpose of the Study:

To compare visual acuity assessment using Lea Symbols® and Patti Pics® ETDRS-style charts.
To determine if these two charts provide clinically similar data for visual acuity measurement.
To inform clinical decisions regarding eye chart selection.

Main Methods:

Visual acuity was tested on the right eyes of 52 consecutive patients (ages 3-88).
The order of chart presentation (Lea Symbols® vs. Patti Pics®) was alternated.
Patients were categorized by age and visual acuity for analysis.

Main Results:

83% of measurements showed equal visual acuity between the two charts.
Lea Symbols® measured one line better in 8% of eyes.
Patti Pics® measured one line better in 9% of eyes.
No significant differences were observed between adults and children, or across different visual acuities.

Conclusions:

Patti Pics® charts perform similarly to Lea Symbols® charts in assessing visual acuity.
The findings are applicable to multi-specialty ophthalmology practices.
Similar performance is suspected in primary care and school settings.