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Related Experiment Video

Updated: May 6, 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

Pacific acuity test: testability, validity, and interobserver reliability.

John P Lowery¹, John R Hayes, Megan Sis

¹*OD, MEd †PhD ‡OD, MS §OD Pacific University College of Optometry, Forest Grove, Oregon (all authors).

Optometry and Vision Science : Official Publication of the American Academy of Optometry

|October 29, 2013

Summary

This summary is machine-generated.

The Pacific Acuity Test (PAT) effectively measures visual acuity in young children, showing high reliability and validity for children 18 months and older. This new test offers valuable recognition acuity data for preverbal children.

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Area of Science:

Ophthalmology
Pediatric Vision Science
Optometry

Background:

Assessing visual acuity in preverbal children is challenging.
Existing tests often measure resolution acuity, not recognition acuity.

Purpose of the Study:

Evaluate the testability, validity, and interobserver reliability of the Pacific Acuity Test (PAT).
The PAT is a novel vanishing optotype test for measuring recognition visual acuities in preverbal children.

Main Methods:

Fifty-two children (6-36 months) were tested with the PAT and Cardiff Acuity Test (CAT).
Two independent observers assessed video recordings for reliability.
Logistic regression analyzed acuity thresholds, validity, and testability.

Main Results:

The PAT achieved high testability (96%) in children 18 months and older.
Recognition acuities from the PAT were higher than CAT resolution acuities.
Interobserver reliability was high for both PAT and CAT (ICC=0.90).

Conclusions:

The Pacific Acuity Test (PAT) is a valid and reliable tool for assessing recognition visual acuity in children from 18 months of age.
PAT provides higher acuity measures than resolution-based tests, especially in younger children.
The test demonstrates excellent interobserver reliability, comparable to the CAT.