RT Journal Article
SR Electronic
T1 Plusoptix Vision Screener™: The accuracy and repeatability of refractive measurements using a new autorefractor
JF British Journal of Ophthalmology
JO Br J Ophthalmol
FD BMJ Publishing Group Ltd.
DO 10.1136/bjo.2008.138123
A1 Annegret Hella Dahlmann-Noor
A1 Oliver Comyn
A1 Vasileios Kostakis
A1 Aseema Misra
A1 Nitin Gupta
A1 Jayne Heath
A1 Janet Brown
A1 Abigail Iron
A1 Stuart McGill
A1 Kalliopi Vrotsou
A1 Anthony J. Vivian
YR 2008
UL http://bjo.bmj.com/content/early/2008/11/10/bjo.2008.138123.abstract
AB Background: The Plusoptix Vision Screener™ (PVS) is a new non-cycloplegic videoretinoscopy autorefractor. Refractive accuracy may affect its performance as a screening tool. Aims: Study 1: To determine intra- and interobserver variability of PVS measurements. Study 2: To compare PVS measurements with gold standard manual cycloplegic retinoscopy (MCR). Methods: Study 1: PVS refraction of 103 children with mean (SD) age 5.5 (0.6) years by two observers. Study 2: PVS and MCR refraction of 126 children with mean (SD) age 5.5 (1.5) years, including 43 children with manifest strabismus ≥ 5PD, comparing mean spherical equivalent (MSE) and Jackson cross cylinders J0 and J45. Results: Study 1: Repeatability coefficients (observer 1): MSE: 0.63D, J0: 0.24D, J45: 0.18 D; those of observer 2 were nearly identical. Mean difference (95% limits of agreement) between the two observers for MSE, J0 and J45 were, respectively, 0.03 (-0.62 to 0.68D), -0.008 (-0.25 to 0.23 D), 0.013 (–0.18 to 0.20) D. Study 2: MSE tended to be lower on PVS than MCR, with differences of up to 8.00 D. Less than 20% of values were within +/-0.50D of each other. Agreement was better for J0 and J45. Strabismus was associated with an odds ratio of 3.7 (95% CI: 1.3 to 10.5) of the PVS failing to obtain a reading. Conclusions: The PVS may underestimate children’s refractive error.