PT  - JOURNAL ARTICLE
AU  - A H Dahlmann-Noor
AU  - O Comyn
AU  - V Kostakis
AU  - A Misra
AU  - N Gupta
AU  - J Heath
AU  - J Brown
AU  - A Iron
AU  - S McGill
AU  - K Vrotsou
AU  - A J Vivian
TI  - Plusoptix Vision Screener: the accuracy and repeatability of refractive measurements using a new autorefractor
AID  - 10.1136/bjo.2008.138123
DP  - 2009 Mar 01
TA  - British Journal of Ophthalmology
PG  - 346--349
VI  - 93
IP  - 3
4099  - http://bjo.bmj.com/content/93/3/346.short
4100  - http://bjo.bmj.com/content/93/3/346.full
SO  - Br J Ophthalmol2009 Mar 01; 93
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 the 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 ⩾5 PD, comparing mean spherical equivalent (MSE) and Jackson cross cylinders J0 and J45.Results: Study 1: Repeatability coefficients (observer 1): MSE: 0.63 D, J0: 0.24 D, J45: 0.18 D; those of observer 2 were nearly identical. The mean difference (95% limits of agreement) between the two observers for MSE, J0 and J45 were, respectively, 0.03 (−0.62 to 0.68 D), −0.008 (−0.25 to 0.23 D) and 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 ±0.50 D 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.