To explore a quantitative glaucoma evaluation tool of glaucoma through the dynamic evaluation of reading ability based on logarithmic Chinese reading acuity chart (C-READ), and investigate its feasibility.
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Inclusion Criteria: * Primary open angle glaucoma in at least 1 eye or labelled as a glaucoma suspect by a glaucoma specialist * Age ≥18 years old * with open angles on gonioscopy * best-corrected visual acuity ≥0.5 * spherical refraction within ±5.0 diopters (D), and/or cylinder correction within 3.0 D Exclusion Criteria: * eyes with any evidence of physical abnormality of the iris or pupils on slit-lamp examination * eyes with a history of trauma or inflammation * undergone an intraocular surgery or laser within the previous 6 months/except uncomplicated cataract surgery * using systemic or topical medications that could affect pupil responses, including pilocarpine or atropine * presence of any media opacities that prevented good quality OCT or fundus images * presence of any retinal or neurological disease other than glaucoma * abnormal ocular motility that prevents binocular fixation (eg, nystagmus, strabismus) * with severe systemic diseases or psychiatric disorders