The influence of age, refractive error, visual demand and lighting conditions on accommodative ability in Malay children and adults

Ai-Hong Chen, Azmir Ahmed, Stephanie Kearney, Niall Strang

Research output: Contribution to journalArticle

Abstract

Purpose: Near work, accommodative inaccuracy and ambient lighting conditions have all been implicated in driving the myopic development mechanism. However, difference in accommodative responses with age and refractive error under different visual conditions remain unclear. This study explores differences in accommodative abilities and refractive error when exposed to differing ambient illumination and visual demands in Malay schoolchildren and adults. Methods: Sixty young adults (21-25 years) and sixty school children (8-12 years) were recruited. Accommodative lag and accommodative fluctuations at far (6 m) and near (25 cm) were measured using the Grand Seiko WAM-5500 open field autorefractor. The effect of mesopic room illumination on accommodation were also investigated. Results: Repeated measures ANOVA indicated that accommodative lag at far and near was significantly different in school children and young adults (F(1.219, 35.354) = 11.857, p < 0.05) with post hoc tests using the Bonferroni correction determined that at near, there was a greater lag in school children (0.486 ± 0.181 D) than young adults (0.259 ± 0.209 D, p < 0.05). Repeated measures ANOVA also determined that accommodative lag differed statistically at near demands between non-myopic group and the myopic group in young adults and school children (F(3.107, 31.431) = 12.187, p < 0.05). Post hoc tests using the Bonferroni correction showed that accommodative lag at near was significantly greater in myopic school children (0.655D ± 0.198D) compared with non-myopic school children (0.202D ± 0.141D, p < 0.05) and myopic young adults (0.316D ± 0.172D, p < 0.05), but no significant difference between myopic young adults (0.316D ± 0.172D) and non- myopic young adults (0.242D ± 0.126D, p > 0.05). Accommodative lag and fluctuations were greater in mesopic room conditions for all ages [all p < 0.05]. Conclusion: Greater accommodative lag was found in myopes compared to emmetropes, school children compared to adults and in mesopic compared to photopic conditions. Accommodative fluctuations were greatest in myopes and in mesopic conditions. These results suggest that differences exist in the amount of blur experienced by myopes and non-myopes at different ages and in different lighting conditions.
Original languageEnglish
Pages (from-to)1997–2004
Number of pages8
JournalGraefe's Archive for Clinical and Experimental Ophthalmology
Volume257
Issue number9
Early online date4 Jul 2019
DOIs
Publication statusPublished - 5 Sep 2019

Fingerprint

Refractive Errors
Lighting
Young Adult
Analysis of Variance

Keywords

  • accomodation
  • myopia
  • illumination
  • children
  • lag of accomodation

Cite this

@article{b0982a75fee64d018c21d56a37cf707f,
title = "The influence of age, refractive error, visual demand and lighting conditions on accommodative ability in Malay children and adults",
abstract = "Purpose: Near work, accommodative inaccuracy and ambient lighting conditions have all been implicated in driving the myopic development mechanism. However, difference in accommodative responses with age and refractive error under different visual conditions remain unclear. This study explores differences in accommodative abilities and refractive error when exposed to differing ambient illumination and visual demands in Malay schoolchildren and adults. Methods: Sixty young adults (21-25 years) and sixty school children (8-12 years) were recruited. Accommodative lag and accommodative fluctuations at far (6 m) and near (25 cm) were measured using the Grand Seiko WAM-5500 open field autorefractor. The effect of mesopic room illumination on accommodation were also investigated. Results: Repeated measures ANOVA indicated that accommodative lag at far and near was significantly different in school children and young adults (F(1.219, 35.354) = 11.857, p < 0.05) with post hoc tests using the Bonferroni correction determined that at near, there was a greater lag in school children (0.486 ± 0.181 D) than young adults (0.259 ± 0.209 D, p < 0.05). Repeated measures ANOVA also determined that accommodative lag differed statistically at near demands between non-myopic group and the myopic group in young adults and school children (F(3.107, 31.431) = 12.187, p < 0.05). Post hoc tests using the Bonferroni correction showed that accommodative lag at near was significantly greater in myopic school children (0.655D ± 0.198D) compared with non-myopic school children (0.202D ± 0.141D, p < 0.05) and myopic young adults (0.316D ± 0.172D, p < 0.05), but no significant difference between myopic young adults (0.316D ± 0.172D) and non- myopic young adults (0.242D ± 0.126D, p > 0.05). Accommodative lag and fluctuations were greater in mesopic room conditions for all ages [all p < 0.05]. Conclusion: Greater accommodative lag was found in myopes compared to emmetropes, school children compared to adults and in mesopic compared to photopic conditions. Accommodative fluctuations were greatest in myopes and in mesopic conditions. These results suggest that differences exist in the amount of blur experienced by myopes and non-myopes at different ages and in different lighting conditions.",
keywords = "accomodation, myopia, illumination, children, lag of accomodation",
author = "Ai-Hong Chen and Azmir Ahmed and Stephanie Kearney and Niall Strang",
note = "Acceptance in SAN AAM: 12m embargo; not yet published 5/7/19 DC.",
year = "2019",
month = "9",
day = "5",
doi = "10.1007/s00417-019-04405-z",
language = "English",
volume = "257",
pages = "1997–2004",
journal = "Graefe's Archive for Clinical and Experimental Ophthalmology",
issn = "0721-832X",
publisher = "Springer-Verlag",
number = "9",

}

TY - JOUR

T1 - The influence of age, refractive error, visual demand and lighting conditions on accommodative ability in Malay children and adults

AU - Chen, Ai-Hong

AU - Ahmed, Azmir

AU - Kearney, Stephanie

AU - Strang, Niall

N1 - Acceptance in SAN AAM: 12m embargo; not yet published 5/7/19 DC.

PY - 2019/9/5

Y1 - 2019/9/5

N2 - Purpose: Near work, accommodative inaccuracy and ambient lighting conditions have all been implicated in driving the myopic development mechanism. However, difference in accommodative responses with age and refractive error under different visual conditions remain unclear. This study explores differences in accommodative abilities and refractive error when exposed to differing ambient illumination and visual demands in Malay schoolchildren and adults. Methods: Sixty young adults (21-25 years) and sixty school children (8-12 years) were recruited. Accommodative lag and accommodative fluctuations at far (6 m) and near (25 cm) were measured using the Grand Seiko WAM-5500 open field autorefractor. The effect of mesopic room illumination on accommodation were also investigated. Results: Repeated measures ANOVA indicated that accommodative lag at far and near was significantly different in school children and young adults (F(1.219, 35.354) = 11.857, p < 0.05) with post hoc tests using the Bonferroni correction determined that at near, there was a greater lag in school children (0.486 ± 0.181 D) than young adults (0.259 ± 0.209 D, p < 0.05). Repeated measures ANOVA also determined that accommodative lag differed statistically at near demands between non-myopic group and the myopic group in young adults and school children (F(3.107, 31.431) = 12.187, p < 0.05). Post hoc tests using the Bonferroni correction showed that accommodative lag at near was significantly greater in myopic school children (0.655D ± 0.198D) compared with non-myopic school children (0.202D ± 0.141D, p < 0.05) and myopic young adults (0.316D ± 0.172D, p < 0.05), but no significant difference between myopic young adults (0.316D ± 0.172D) and non- myopic young adults (0.242D ± 0.126D, p > 0.05). Accommodative lag and fluctuations were greater in mesopic room conditions for all ages [all p < 0.05]. Conclusion: Greater accommodative lag was found in myopes compared to emmetropes, school children compared to adults and in mesopic compared to photopic conditions. Accommodative fluctuations were greatest in myopes and in mesopic conditions. These results suggest that differences exist in the amount of blur experienced by myopes and non-myopes at different ages and in different lighting conditions.

AB - Purpose: Near work, accommodative inaccuracy and ambient lighting conditions have all been implicated in driving the myopic development mechanism. However, difference in accommodative responses with age and refractive error under different visual conditions remain unclear. This study explores differences in accommodative abilities and refractive error when exposed to differing ambient illumination and visual demands in Malay schoolchildren and adults. Methods: Sixty young adults (21-25 years) and sixty school children (8-12 years) were recruited. Accommodative lag and accommodative fluctuations at far (6 m) and near (25 cm) were measured using the Grand Seiko WAM-5500 open field autorefractor. The effect of mesopic room illumination on accommodation were also investigated. Results: Repeated measures ANOVA indicated that accommodative lag at far and near was significantly different in school children and young adults (F(1.219, 35.354) = 11.857, p < 0.05) with post hoc tests using the Bonferroni correction determined that at near, there was a greater lag in school children (0.486 ± 0.181 D) than young adults (0.259 ± 0.209 D, p < 0.05). Repeated measures ANOVA also determined that accommodative lag differed statistically at near demands between non-myopic group and the myopic group in young adults and school children (F(3.107, 31.431) = 12.187, p < 0.05). Post hoc tests using the Bonferroni correction showed that accommodative lag at near was significantly greater in myopic school children (0.655D ± 0.198D) compared with non-myopic school children (0.202D ± 0.141D, p < 0.05) and myopic young adults (0.316D ± 0.172D, p < 0.05), but no significant difference between myopic young adults (0.316D ± 0.172D) and non- myopic young adults (0.242D ± 0.126D, p > 0.05). Accommodative lag and fluctuations were greater in mesopic room conditions for all ages [all p < 0.05]. Conclusion: Greater accommodative lag was found in myopes compared to emmetropes, school children compared to adults and in mesopic compared to photopic conditions. Accommodative fluctuations were greatest in myopes and in mesopic conditions. These results suggest that differences exist in the amount of blur experienced by myopes and non-myopes at different ages and in different lighting conditions.

KW - accomodation

KW - myopia

KW - illumination

KW - children

KW - lag of accomodation

U2 - 10.1007/s00417-019-04405-z

DO - 10.1007/s00417-019-04405-z

M3 - Article

VL - 257

SP - 1997

EP - 2004

JO - Graefe's Archive for Clinical and Experimental Ophthalmology

JF - Graefe's Archive for Clinical and Experimental Ophthalmology

SN - 0721-832X

IS - 9

ER -