Globally, approximately 90% of all vision impairment can be prevented or treated. Uncorrected refractive problems account for more than 53% of all cases of vision impairment. Simple-to-use and affordable hand-held autorefractors have the potential to address challenges in addressing refractive errors, particularly for underserved populations that have little or no access to eye care. ATscale is supporting a large-scale study to determine the effectiveness and feasibility of using hand-held autorefractors in LMICs.