Inclusion Criteria:  Be between 18 and 45 years of age. Have normal/corrected-to-normal monocular acuity of better than 20/25 for both eyes. Have normal contrast sensitivity. Be a native English speakers or possess college-level English reading proficiency. Have a current optical prescription (obtained less than 2 years ago). Have accommodative dysfunctions, including reduced accommodative amplitude, range, facility and endurance.  Exclusion Criteria:  Have no prismatic correction. No clinically significant ocular pathology (e.g., cataract, keratoconus, dry eye, diabetic retinopathy, or age-related macular degeneration) that would limit the effectiveness of vision training. Have no binocular dysfunction, including amblyopia, strabismus, and other binocular diseases that would impede accommodative training.