ArticleVision research2026
Relationship between form-deprivation myopia and amblyopic deficit.
Article in Vision research, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
This study investigated the relationship between form-deprivation myopia and amblyopic deficit. Five rhesus monkeys underwent monocular form-deprivation beginning at 24 ± 2 days of age. Lightweight helmets held a light-perception only Bangerter filter over the right eye and a plano lens over the left eye. Refractive error and axial length were measured biweekly using streak retinoscopy and noncontact biometry. After 135 ± 2 days of treatment, visual function in each eye was assessed under sedation by recording Visual Evoked Potentials (VEP) elicited by monocular stimulation with square wave gratings (spatial frequencies 0.25-16 cycles per degree). An Ocular Dominance Index (ODI), the difference in VEP amplitudes between form-deprived (amblyopic) eye stimulation and fellow (control) eye stimulation divided by the sum, quantified amblyopic deficits. At the end of treatment, mean spherical equivalent refraction and axial length were -0.43 ± 4.41 D and 16.66 ± 0.70 mm in form-deprived eyes and +1.75 ± 2.71 D and 16.07 ± 0.61 mm in fellow eyes, respectively. Anisometropia was highly variable, ranging from -6.13 to +2.75 D (mean -2.18 ± 3.60 D). All monkeys demonstrated a significant amblyopic deficit, with a mean ODI of -0.66 ± 0.11 (range: -0.43 to -0.81). Correlations between ODI and anisometropia and ODI and axial length were not significant in this small cohort. Monocular form-deprivation in young rhesus monkeys produced a robust amblyopic deficit as measured by VEPs, even in the absence of myopia. Findings indicate that form-deprivation induces central visual pathway deficits may not be correlated with the amplitude of form-deprivation myopia.
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