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. 2022 Feb 25;16:489–505. doi: 10.2147/OPTH.S342666

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© 2022 Arnold et al.

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Refractive comparison of three photorefractors. Plusoptix A12, the Welch Allyn SPOT and the Adaptica 2WIN infrared autorefractors are compared with cycloplegic examination in children analyzed by Bland Altmann analysis of Spherical Equivalent (M), J0 and J45 vector transformation and also the ABCD Ellipsoid unitary variable shown in Box and Whisker Plot and Column demonstrating GRADE match.