Portable Autorefractors for Detecting Axial Length Changes in Space

Aerospace Medicine and Human Performance
Kseniya S MasterovaJay C Buckey

Abstract

We evaluated the reproducibility of two portable, self-administered autorefractors (Netra and SVOne Pro) to assess the time course of visual changes on the ISS. We measured cycloplegic refractive error at 5 visits at least a week apart in 13 subjects (6 women, 7 men, 30 ± 9 yr) using both devices seated and also prone with lower body positive pressure (LBPP) applied. Axial length was measured with an optical biometer. Subjects completed a questionnaire on device preferences. The SVOne seated intrasession reproducibility coefficient (RPC) was 0.37 diopters (D), while the Netra's was 0.41 D. Intersession seated results were: RPC = 0.67 D for the SVOne and RPC = 0.54 D for the Netra. The average seated to prone LBPP differences were significantly different from zero for both the SVOne and Netra. The SVOne was preferred in four out of five categories on the questionnaire and took half the time to complete a measurement set compared to the Netra. Users preferred the SVOne and it took less time. An SVOne refraction change of 0.67 D from baseline would happen by chance less than 5% of the time. If multiple separate measurements were taken, the detection limit could be reduced (e.g., three repeated measurements could reduce it to 0.38 ...Continue Reading

Citations

Dec 4, 2019·Current Opinion in Neurology·Peter WojcikAndrew G Lee
Aug 12, 2020·Journal of Telemedicine and Telecare·Anindya SamantaPatricia C Nelson
Oct 30, 2020·Eye and Brain·Yosbelkys Martin PaezPrem S Subramanian
Feb 27, 2021·Optometry and Vision Science : Official Publication of the American Academy of Optometry·William PlumDavid S Friedman
Jun 11, 2021·International Journal of Audiology·Chris A BrooksJay C Buckey

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