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Repeatability of ARK-30 in a pediatric population.
- Source :
-
Indian Journal of Ophthalmology . Sep2018, Vol. 66 Issue 9, p1262-1267. 6p. - Publication Year :
- 2018
-
Abstract
- <bold>Purpose: </bold>To determine repeatability and agreement of the ARK-30 handheld autorefractor with retinoscopy under cycloplegic and noncycloplegic conditions in children.<bold>Methods: </bold>Three consecutive autorefractor measurements (with and without cycloplegia) and retinoscopy were performed and compared in 30 randomized eyes of 30 children (mean age of 6.7 ± 2.7 years with spherical equivalent [SE] refraction from ‒4.01 to +7.38 D) in a cross-section and masked study. Bland-Altman analysis of autorefractor measurements (with and without cycloplegia) and agreement with retinoscopy were calculated with conventional notation (sphere [Sph] and cylinder [Cyl]) and vector notation (SE, J0, and J45coefficients).<bold>Results: </bold>ARK-30 measurements without cycloplegia were lower than under cycloplegic conditions (Sph: ‒0.52 ± 2.37 D vs + 0.86 ± 2.60 D, P < 0.01; Cyl: ‒0.83 ± 0.80 D versus ‒0.78 ± 0.77 D, P = 0.37; and SE: ‒0.94 ± 2.19 D vs + 0.47 ± 2.44 D, P < 0.01, respectively) and statistically different (P < 0.03) from retinoscopy (Shp: +0.83 ± 2.66 D; Cyl: ‒0.71 ± 0.87 D; SE: +0.51 ± 2.49 D). Without statistical differences were in J0and J45coefficients. Cyloplegic autorefraction measures were not found to be statistically significantly different to retinoscopy measures. ARK-30 under cycloplegia shows better repeatability with lower limits of agreement (LoA) in Sph (LoA: ‒0.66 to +0.69 D), and SE (LoA: ‒0.66 to +0.65 D) than without cycloplegia (LoA: ‒1.45 to +1.77 D, and ‒1.38 to +1.74 D, respectively).<bold>Conclusion: </bold>Under noncycloplegic conditions, ARK-30 autorefractor has low repeatability and a tendency toward minus over correction in children. However, repeatability and agreement with retinoscopy under cycloplegic conditions allow use of ARK-30 in children to estimate refraction but not to substitute gold standard retinoscopic refraction. [ABSTRACT FROM AUTHOR]
- Subjects :
- *AUTOREFRACTORS
*RETINOSCOPY
*INTRAOCULAR lenses
*REFRACTIVE errors
*ASTIGMATISM
*VISION disorders
*VISION testing equipment
*COMPARATIVE studies
*VISUAL accommodation
*RESEARCH methodology
*MEDICAL cooperation
*RESEARCH
*PRODUCT design
*EVALUATION research
*DISEASE incidence
*CROSS-sectional method
Subjects
Details
- Language :
- English
- ISSN :
- 03014738
- Volume :
- 66
- Issue :
- 9
- Database :
- Academic Search Index
- Journal :
- Indian Journal of Ophthalmology
- Publication Type :
- Academic Journal
- Accession number :
- 131338207
- Full Text :
- https://doi.org/10.4103/ijo.IJO_266_18