Abstract: An unmanned wearable apparatus for measuring the refractive error of an eye is disclosed. Said apparatus comprises: a visual acuity testing unit that is configured to measure the visual acuity of a person wearing said apparatus by forming a final image at 6 meters; an objective refraction testing unit that is configured to measure the objective refraction of said person; a subjective refraction testing unit that is configured to measure the subjective refraction of said person; and a control member (110) that is configured to monitor and control the operations of said apparatus. Said apparatus is configured to automatically switch from one test to another. The disclosed apparatus: is portable; is unmanned (can be used without a medical professional's help); and helps save space.