Evaluation of A Modified Persian Version of the Developmental Eye Movement Test in Children
4 affiliations
- 1Department of Optometry, School of Rehabilitation Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
- 2Department of Optometry, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran
- 3Poostchi Ophthalmology Research Center, Department of Ophthalmology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
- 4Proteomics Research Center, Department of Biostatistics, School of Allied Medical Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran
Abstract
Purpose: To adapt and evaluate the Developmental Eye Movement (DEM) test in Persian for Iranian children aged 7-12 years, to evaluate developmental changes across ages, and to compare performance with the American normative sample to identify potential linguistic and cultural influences on oculomotor behavior.
Methods: The DEM test was developed by translating the original numbers into Persian numerals. Awe enrolled a sample of 720 Iranian children aged 7-12 years utilizing a stratified random sampling method from four educational districts in Shiraz. The assessment was administered in accordance with the standardized protocol detailed in the official manual, except that the numerals were read from right to left. To evaluate test reliability, a subset of 160 children aged 8-9 years underwent retesting.
Results: Administration of the DEM test revealed age-related improvements in oculomotor skill that reached a plateau around age 10. Iranian children were slower than the American normative sample on both vertical and horizontal tasks, produced higher ratios, and made more errors in most age groups. These differences had largely evened out by age 12, pointing to the influence of linguistic and orthographic factors. The test was highly reliable across repeated administrations (coefficients: 0.78-0.95).
Conclusion: This study thus provides Persian-language normative data and supports the reliability of the DEM test for this population. This investigation successfully established Persian-language normative data for the DEM test and confirmed the instrument's reliability within an Iranian population. In light of the substantial influence of cultural and linguistic factors on oculomotor behavior, these findings emphasize the critical need to utilize population-specific norms to ensure diagnostic accuracy and prevent the misclassification of typically developing readers.
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BibTeX
@article{osroosh2026evaluation,
title = {{Evaluation of A Modified Persian Version of the Developmental Eye Movement Test in Children}},
author = {Enayatollah Osroosh and Saeed Rahmani and Ebrahim Jafarzadehpour and Haleh Kangari and Mohammad Reza Talebnejad and Ali Reza Akbarzadeh Baghban and Saeedeh Hoseinmenni},
journal = {Journal of Ophthalmic \& Vision Research},
year = {2026},
month = oct,
doi = {10.18502/jovr.v21.20739},
url = {https://doi.org/10.18502/jovr.v21.20739},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Evaluation of A Modified Persian Version of the Developmental Eye Movement Test in Children
AU - Enayatollah Osroosh
AU - Saeed Rahmani
AU - Ebrahim Jafarzadehpour
AU - Haleh Kangari
AU - Mohammad Reza Talebnejad
AU - Ali Reza Akbarzadeh Baghban
AU - Saeedeh Hoseinmenni
PY - 2026
DA - 2026/10/14
JO - Journal of Ophthalmic & Vision Research
DO - 10.18502/jovr.v21.20739
UR - https://doi.org/10.18502/jovr.v21.20739
AB - Purpose: To adapt and evaluate the Developmental Eye Movement (DEM) test in Persian for Iranian children aged 7-12 years, to evaluate developmental changes across ages, and to compare performance with the American normative sample to identify potential linguistic and cultural influences on oculomotor behavior. Methods: The DEM test was developed by translating the original numbers into Persian numerals. Awe enrolled a sample of 720 Iranian children aged 7-12 years utilizing a stratified random sampling method from four educational districts in Shiraz. The assessment was administered in accordance with the standardized protocol detailed in the official manual, except that the numerals were read from right to left. To evaluate test reliability, a subset of 160 children aged 8-9 years underwent retesting. Results: Administration of the DEM test revealed age-related improvements in oculomotor skill that reached a plateau around age 10. Iranian children were slower than the American normative sample on both vertical and horizontal tasks, produced higher ratios, and made more errors in most age groups. These differences had largely evened out by age 12, pointing to the influence of linguistic and orthographic factors. The test was highly reliable across repeated administrations (coefficients: 0.78-0.95). Conclusion: This study thus provides Persian-language normative data and supports the reliability of the DEM test for this population. This investigation successfully established Persian-language normative data for the DEM test and confirmed the instrument's reliability within an Iranian population. In light of the substantial influence of cultural and linguistic factors on oculomotor behavior, these findings emphasize the critical need to utilize population-specific norms to ensure diagnostic accuracy and prevent the misclassification of typically developing readers.
SN - 2008-2010
SN - 2008-322X
ER -