Investigational Study of Accommodation Triggering and Control to Allow for the Performance of Refraction Measurements

Inclusion Criteria: * Male or Female * Age 18 through 30 years at the time of consent * Binocular vision * Willing and able to give informed consent and follow all study procedures and requirements * Fluent in English Exclusion Criteria: * Spherical correction \> +4D or \< -5D, astigmatism \< -2.5D. * Using anticholinergic medications (including first-generation antihistamines) or other medications known to affect visual acuity within the greater of 3 days or 5 half-lives prior to enrolling in this study * Using an investigational drug or approved therapy for investigational use within the greater of 3 days or 5 half-lives prior to enrolling in this study * Has initiated any new medication in the past 2 weeks that, in the best medical judgment of the investigator, would impact their participation in the study or ability to use EyeQue devices * Reported or observed eye disease or pathology, including but not limited to: * Glaucoma * Cataracts * Macular degeneration * Eye infection * Keratoconus * Diabetic neuropathy/retinopathy * Cytomegalovirus retinitis * Color blindness (any color deficiency) * Diabetic macular edema * Amblyopia * Chronic or acute uveitis (cells and/or flare in anterior chamber) * Strabismus (exotropia, esotropia, and hypertropia) * Macular hole * Eye surgery within the last 12 months (including Lasik or lens replacement) * Subject does not have the physical dexterity to properly operate the EyeQue VisionCheck device or the EyeQue app on the smartphone in the investigator's opinion * PD smaller than 50mm or larger than 75mm. * Any self-reported mental illness or condition, including but not limited to: claustrophobia, fear of simulators, nyctophobia. * Any self-reported neurological diseases, including but not limited to: epilepsy, Alzheimer's, nystagmus.