Assessment of Visual Acuity in Children Using Crowded Lea Symbol Charts

Ananth Sailoganathan, Leong Xin Rou, Kenny Anak Buja, John Siderov

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

SIGNIFICANCE Vision charts comprising single Lea symbols surrounded by either flanking bars or flanking Lea symbols are available for measurement of visual acuity in children. However, the results obtained with such charts may not be interchangeable owing to potential differences in the crowding effect. PURPOSE The purpose of this study was to compare habitual visual acuity in a sample of young children using two versions of the single Lea symbols charts with different crowding features. METHODS Monocular habitual visual acuity was measured in a sample of 77 young children aged between 4 and 6 years using crowded Lea symbols charts with either flanking bars separated from the central symbol by 0.5 optotype width or flanking Lea optotypes separated from the central symbol by 1.0 optotype width. RESULTS Mean visual acuity was higher (i.e., lower logarithm of the minimum angle of resolution) with the Lea symbols crowded using flanking optotypes, equivalent to about 1.5 optotype difference. Visual acuity measured with the two charts was significantly correlated; however, the 95% limits of agreement were larger than expected from repeatability studies using Lea symbols. CONCLUSIONS Lea symbols with flanking optotypes resulted in higher visual acuity than the Lea symbols with flanking bars, probably as a result of differences in the crowding effect. The two charts showed insufficient agreement, and we do not recommend their use interchangeably. We recommend using the Lea symbols with flanking bars because of the closer flanker-target separation.

LanguageEnglish
Pages643-647
Number of pages5
JournalOptometry and Vision Science
Volume95
Issue number8
DOIs
Publication statusPublished - 1 Aug 2018
Externally publishedYes

Fingerprint

Visual Acuity
Crowding

Cite this

Sailoganathan, Ananth ; Rou, Leong Xin ; Buja, Kenny Anak ; Siderov, John. / Assessment of Visual Acuity in Children Using Crowded Lea Symbol Charts. In: Optometry and Vision Science. 2018 ; Vol. 95, No. 8. pp. 643-647.
@article{8df9ce640d8b4849a3eed8826ddd8746,
title = "Assessment of Visual Acuity in Children Using Crowded Lea Symbol Charts",
abstract = "SIGNIFICANCE Vision charts comprising single Lea symbols surrounded by either flanking bars or flanking Lea symbols are available for measurement of visual acuity in children. However, the results obtained with such charts may not be interchangeable owing to potential differences in the crowding effect. PURPOSE The purpose of this study was to compare habitual visual acuity in a sample of young children using two versions of the single Lea symbols charts with different crowding features. METHODS Monocular habitual visual acuity was measured in a sample of 77 young children aged between 4 and 6 years using crowded Lea symbols charts with either flanking bars separated from the central symbol by 0.5 optotype width or flanking Lea optotypes separated from the central symbol by 1.0 optotype width. RESULTS Mean visual acuity was higher (i.e., lower logarithm of the minimum angle of resolution) with the Lea symbols crowded using flanking optotypes, equivalent to about 1.5 optotype difference. Visual acuity measured with the two charts was significantly correlated; however, the 95{\%} limits of agreement were larger than expected from repeatability studies using Lea symbols. CONCLUSIONS Lea symbols with flanking optotypes resulted in higher visual acuity than the Lea symbols with flanking bars, probably as a result of differences in the crowding effect. The two charts showed insufficient agreement, and we do not recommend their use interchangeably. We recommend using the Lea symbols with flanking bars because of the closer flanker-target separation.",
author = "Ananth Sailoganathan and Rou, {Leong Xin} and Buja, {Kenny Anak} and John Siderov",
year = "2018",
month = "8",
day = "1",
doi = "10.1097/OPX.0000000000001253",
language = "English",
volume = "95",
pages = "643--647",
journal = "Optometry and Vision Science",
issn = "1040-5488",
publisher = "Lippincott Williams and Wilkins",
number = "8",

}

Assessment of Visual Acuity in Children Using Crowded Lea Symbol Charts. / Sailoganathan, Ananth; Rou, Leong Xin; Buja, Kenny Anak; Siderov, John.

In: Optometry and Vision Science, Vol. 95, No. 8, 01.08.2018, p. 643-647.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Assessment of Visual Acuity in Children Using Crowded Lea Symbol Charts

AU - Sailoganathan, Ananth

AU - Rou, Leong Xin

AU - Buja, Kenny Anak

AU - Siderov, John

PY - 2018/8/1

Y1 - 2018/8/1

N2 - SIGNIFICANCE Vision charts comprising single Lea symbols surrounded by either flanking bars or flanking Lea symbols are available for measurement of visual acuity in children. However, the results obtained with such charts may not be interchangeable owing to potential differences in the crowding effect. PURPOSE The purpose of this study was to compare habitual visual acuity in a sample of young children using two versions of the single Lea symbols charts with different crowding features. METHODS Monocular habitual visual acuity was measured in a sample of 77 young children aged between 4 and 6 years using crowded Lea symbols charts with either flanking bars separated from the central symbol by 0.5 optotype width or flanking Lea optotypes separated from the central symbol by 1.0 optotype width. RESULTS Mean visual acuity was higher (i.e., lower logarithm of the minimum angle of resolution) with the Lea symbols crowded using flanking optotypes, equivalent to about 1.5 optotype difference. Visual acuity measured with the two charts was significantly correlated; however, the 95% limits of agreement were larger than expected from repeatability studies using Lea symbols. CONCLUSIONS Lea symbols with flanking optotypes resulted in higher visual acuity than the Lea symbols with flanking bars, probably as a result of differences in the crowding effect. The two charts showed insufficient agreement, and we do not recommend their use interchangeably. We recommend using the Lea symbols with flanking bars because of the closer flanker-target separation.

AB - SIGNIFICANCE Vision charts comprising single Lea symbols surrounded by either flanking bars or flanking Lea symbols are available for measurement of visual acuity in children. However, the results obtained with such charts may not be interchangeable owing to potential differences in the crowding effect. PURPOSE The purpose of this study was to compare habitual visual acuity in a sample of young children using two versions of the single Lea symbols charts with different crowding features. METHODS Monocular habitual visual acuity was measured in a sample of 77 young children aged between 4 and 6 years using crowded Lea symbols charts with either flanking bars separated from the central symbol by 0.5 optotype width or flanking Lea optotypes separated from the central symbol by 1.0 optotype width. RESULTS Mean visual acuity was higher (i.e., lower logarithm of the minimum angle of resolution) with the Lea symbols crowded using flanking optotypes, equivalent to about 1.5 optotype difference. Visual acuity measured with the two charts was significantly correlated; however, the 95% limits of agreement were larger than expected from repeatability studies using Lea symbols. CONCLUSIONS Lea symbols with flanking optotypes resulted in higher visual acuity than the Lea symbols with flanking bars, probably as a result of differences in the crowding effect. The two charts showed insufficient agreement, and we do not recommend their use interchangeably. We recommend using the Lea symbols with flanking bars because of the closer flanker-target separation.

UR - http://www.scopus.com/inward/record.url?scp=85051067838&partnerID=8YFLogxK

U2 - 10.1097/OPX.0000000000001253

DO - 10.1097/OPX.0000000000001253

M3 - Article

VL - 95

SP - 643

EP - 647

JO - Optometry and Vision Science

T2 - Optometry and Vision Science

JF - Optometry and Vision Science

SN - 1040-5488

IS - 8

ER -