Study of a Hand-held Device Plus Mobile App Versus Standard Eye Care Devices in Measuring Refractive Error of the Eye

Inclusion Criteria:

• Male or Female
• Age 30 through 65 years at the time of consent
• Binocular vision
• Subject desires refraction for correction of visual acuity and vision can be correctedin each eye to 20/20 (LogMAR 0.0)
• Willing and able to give informed consent and follow all study procedures andrequirements
• Ability to speak and understand the English language

Exclusion Criteria:

• Spherical correction > +8 or < -10
• Using anticholinergic medications (including first-generation antihistamines) or othermedications known to affect visual acuity within the greater of 3 days or 5 half-livesprior to enrolling in this study
• Using an investigational drug or approved therapy for investigational use within thegreater 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 medicaljudgment of the investigator, would impact their participation in the study or abilityto use the device
• Eye disease, including but not limited to:
• Glaucoma (≥ 22 mmHg intraocular pressure)
• Cataracts (≥ 1+ nuclear sclerotic cataract, ≥ 1+ cortical, posterior subcapsularcataract [any grade using the Lens Opacities Classification System III])
• Macular degeneration (retinal pigmented epithelium mottling and/or any drusenwithin 500 μm of macula)
• Eye infection (corneal ulcer, corneal infiltrates, superficial punctatekeratitis)
• Keratoconus
• Diabetic neuropathy/retinopathy (≥ mild nonproliferative diabetic retinopathy)
• Cytomegalovirus retinitis
• Color blindness (any color deficiency)
• Diabetic macular edema (evidence of fluid)
• Amblyopia
• Chronic or acute uveitis (cells and/or flare in anterior chamber)
• Strabismus (exotropia, esotropia, and hypertropia)
• Abnormal astigmatism (mild to severe, > 5 diopters)
• 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 device or the onthe smartphone in the investigator's opinion.