Oculomotor dynamics in emmetropes, myopes, and hyperopes: A behavioral perspective

Suraj Upadhyaya

PLOS ONE, 2025, vol. 20, issue 12, 1-16

Abstract: Purpose: The oculomotor system, which controls eye movements, is closely linked to visual processing. While refractive errors are common, their influence on oculomotor behavior remains underexplored. This study compared oculomotor performance among emmetropic, myopic, and hyperopic individuals. Methods: In this cross-sectional, single-visit study, 67 participants (33 myopes, 10 hyperopes, 24 emmetropes; mean age 25.9 ± 3.0 years) completed fixation and visually guided saccade tasks at a viewing distance of 57 cm. A centrally positioned black, disc-shaped target (0.50° in diameter) was displayed on the screen for 45 seconds, after which it shifted to a predetermined location to elicit visually guided saccades. Clinical measures were included in the correlation analysis to ensure the findings were clinically relevant and to examine relationships between research variables and patient outcomes. Eye movements were recorded using the EyeLink 1000Plus. Fixation stability was quantified using Bivariate Contour Ellipse Area (BCEA). Fixational saccade metrics, vergence stability, and saccadic behavior were analyzed. Axial length and corneal power were measured using a portable ultrasound scanner. Results: Fixation stability differed significantly across groups, with myopes exhibiting larger BCEA values compared to emmetropes (H[2] = 10.6, p

Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0339294

DOI: 10.1371/journal.pone.0339294

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