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Visual acuity and stereopsis across the parafoveal and perifoveal retina in young adults: an eccentricity and meridian analysis

Year: 2026

Type: article

Abstract: Background: Visual acuity (VA) and stereoacuity (SVA) are fundamental visual functions that decline with increasing retinal eccentricity. Patients with macular degeneration and other central vision disorders often rely on paracentral vision, yet location-specific reference data for VA and SVA across the parafoveal and perifoveal retina remain limited. This study aimed to quantify the distribution of binocular VA and SVA across eccentricity and meridian in young adults, develop prediction equations with 95% prediction intervals, and examine the relationship between these two visual functions in the paracentral retina. Methods: Thirty-five healthy young adults (13 males, 22 females; mean age 27.23 ± 2.43 years) were recruited. Binocular VA and SVA were measured at 48 test positions across eight meridians (0°, 45°, 90°, 135°, 180°, 225°, 270°, 315°) and six eccentricities (2.5° to 15° in 2.5° increments) using a polarized 3D display system. A four-alternative forced-choice task was employed with tumbling E optotypes for VA and random-dot stereograms for SVA. Eye tracking ensured fixation stability throughout testing. Generalized estimating equations were used to analyze the effects of eccentricity and meridian. Linear mixed-effects models and Bayesian Tobit models were employed to develop prediction equations. Ten-fold cross-validation assessed model generalizability. Results: > 0.05). Conclusions: VA and SVA deteriorate with increasing eccentricity in the paracentral retina, with stereopsis declining approximately three times faster and demonstrating a more pronounced horizontal-over-vertical advantage. The absence of correlation between VA and SVA suggests distinct neural mechanisms underlying these functions. The prediction equations with 95% prediction intervals provide reference benchmarks for healthy young adults, facilitating clinical interpretation of patient measurements and enabling objective assessment of disease-related changes in paracentral visual function.

Source: PeerJ

DOI: 10.7717/peerj.21251

Authors: Bo Yu, Lu Liu, Ning Yang, Lingxian Xu, Huang Wu

Institutions: Jilin University, Second Affiliated Hospital of Jilin University, Henan Provincial People's Hospital

Language: English

Topic: Visual perception and processing mechanisms

Subfield: Cognitive Neuroscience

Field: Neuroscience

Domain: Life Sciences

SDG: Good health and well-being

Open Access status: gold

Estimated APC paid: $1,395