Consider Fixation and Eye Movement Changes in High Myopia

High myopia has been associated with structural retinal and choroidal alterations that may impair visual function. Fixation instability and altered eye movements have been reported in various ocular diseases, but their combined functional impact in high myopia remains insufficiently explored. In a recent study, researchers from Turkey deliberately focused on functional reading-related measures, including fixation count, regression frequency and fixation duration, which have been shown to be reliably captured using eye trackers operating in the 60Hz to 120Hz range and are widely used to characterize reading behavior under natural viewing conditions. High myopic participants exhibited significantly greater dispersion of gaze points and larger bivariate contour ellipse area values than emmetropic participants, indicating reduced fixation stability. From a clinical standpoint, these findings emphasize that high myopia should not be regarded solely as a refractive condition. Even in the absence of overt pathology, high myopic eyes exhibit measurable alterations in fixation control and reading-related eye movements. Photo: Çelik G, et al. BMC Ophthalmol. March 17, 2026. Click image to enlarge. Their findings revealed that high myopia was associated with reduced fixation stability derived from raw gaze data and with altered reading-related saccadic eye movements under binocular viewing conditions. Representative raw gaze distributions visually confirmed the spatial dispersion underlying these quantitative findings. Together, these results suggested that axial elongation may be associated with a distinct oculomotor phenotype characterized by subtle but functionally relevant adaptations in both static and dynamic eye movement control.“Our findings suggest that reduced fixation stability in high myopia is accompanied by subtle yet consistent changes in reading eye movement patterns, even when reading speed remains unaffected,” the study authors wrote in their paper. “By combining raw gaze point visualization, fixation stability metrics derived from these raw data and functional reading parameters, our findings extend current knowledge on the oculomotor consequences of axial elongation beyond conventional clinical measures.”In this cross-sectional study, 29 emmetropic and 23 high myopic participants were included. Participants underwent comprehensive ophthalmic examination, axial length measurement and infrared eye-tracking software. Fixation stability was assessed via bivariate contour ellipse area derived from raw gaze data during a 10-second binocular fixation task. Saccadic parameters during reading (reading speed, regression count, fixation count, and duration) were also analyzed.High myopes showed significantly higher bivariate contour ellipse area values (bivariate contour ellipse area 68% values: 2.34deg2 vs. 0.865deg²), indicating reduced fixation stability. Reading speed was similar (259.34 words/min vs. 249.11 words/min), but regressions (18.26 vs. 10.10) and the total number of fixations (99.12 vs. 63.26) increased, and mean fixation duration decreased (160.43ms vs. 349.12ms).This pattern demonstrated in this study suggests that high myopic individuals may adopt compensatory oculomotor strategies to maintain reading performance despite reduced fixation stability. For instance, the shorter fixation durations and higher regression rates could represent an adaptive response to unstable gaze, allowing repeated sampling of text to compensate for potential visual blur or fatigue.“These findings support the concept that quantitative eye-tracking metrics reflect higher-order oculomotor network function rather than purely optical or retinal factors,” the study concluded. “In this context, the altered fixation stability and reading-related saccadic behavior observed in high myopia may similarly reflect adaptive or maladaptive responses of central oculomotor control mechanisms to degraded or altered sensory input.”Click here for the journal source. Çelik G, Eröz P, Dursun Ö, Doğan MS. High myopia extends beyond a refractive error: evidence from fixation stability and reading-related saccadic eye movements. BMC Ophthalmol. March 17, 2026. [Epub ahead of print].  This article was developed by the editorial staff in conjunction with experts in the field. In the process, AI may have been among the editorial tools used to meet the goals of human editors, who approved all content.