Programme

P.45 -- Posters, VCTP-50

Date: Tuesday, 5 August 2025

Time: 08:30 - 10:00

Modeling Myopia Progression through an Evolution Equation: Interactions Between Stimulus, Attention, and Eye Elasticity

Nguyen Văn Hoa1, Pham Hong Duong2, Duong Thi Giang2 and Nguyen Tri Lan3

1Hochiminh Pedagogical University, 270 An Duong Vuong, Hochiminh City, Viet Nam 2Institute of Materials Science, VAST, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam 3Institute of Physics,Vietnam Academy of Science and Technology, 10 Dao Tan, Ba Dinh, Viet Nam E-mail: nvhoa62@yahoo.com

Abstract. The rapid rise in myopia prevalence globally underscores the need for a mechanistic understanding of eye growth regulation. While genetic predisposition contributes, recent evidence strongly implicates visual behavior and environmental factors, especially near work and outdoor light exposure—as critical drivers of refractive development. This study proposes a novel Eye Evolution Model (EEM) describing myopia progression as a dynamic interplay between optical stimuli, behavioral patterns, and age-dependent ocular biomechanical properties. Inspired by viscoelastic and RC-charging analogies, the EEM describes axial elongation as a stimulus-response process regulated by a mechanical time constant (τ), reflecting ocular elasticity and compliance. The model introduces a lifestyle modulation term to account for cumulative visual tasks influenced by behavioral continuity and intensity. Unlike previous empirical models, thismechanisticapproachexplainsobservedphenomenasuchasstabilizationofmoderatemyopia, accelerated progression following full correction, and refractive stability during inattentive vision or sleep. Unlike probabilistic models, the EEM reveals that refractive change emerges only when environmental, behavioral, and biological factors interact simultaneously highlighting their multiplicative, not additive, relationship. The EEM offers new insights into longstanding debates regarding defocus, accommodation, and behavioral influences on myopia. By quantifying environmental, behavioral, and biomechanical contributions, the EEM provides a foundation for personalized strategies to predict and control myopia progression. Keywords: myopia progression, emmetropia, axial elongation, evolution model, evolution equation

Presenter: Nguyễn Văn Hoa