... and efficient. 3.For young children or with language barrier, Portable auto refractometerThe HAR-800 vision screener can check the refractive error ... with one-button touch from 14 inches(35cm)away. 6. Portable: Easy carrying and available printer receives results through a remote ... hyperopia), astigmatism (asymmetrical focus), and anisometropia (unequal power between eyes). Portable auto refractometer