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16 inches 20/20 reduced Snellen ability accommodation and convergence activity amount of base-in amount of base-out amount of prism amplitude of accommodation anisometropia astigmatic base-down base-in prism basic finding binocular vision blur C-type central nervous system checked low convergence pattern cross-cylinder test diplopia dissociated cross-cylinder duction duction test dynamic retinoscopy emmetrope emmetropia environment environmental demand exophoria expected value factors function fusional reserve habitual hyperopia hyperopic Illumination individual Induced Phoria inhibition left eye lens application lens power Lenses in place low-low modified muscle myope myopia near-point negative relative negative relative accommodation normal optometric optometrist organism orthophoria patient reports phoria test Phoroptor adjustment Positive Relative Accommodation prism diopters Prisms in place recovery refractive error relative convergence right eye Risley prisms single vision standard acuity static retinoscopy subjective finding Test distance tion tive total lenses vergence visual achievement visual discomfort visual pattern visual performance visual problem visual training