Abstract: Objective refraction error measuring apparatuses are known. Once the measurement is done, there is no known method for confirming if the measurements are correct. Disclosed is an apparatus (200) wherein once the error is measured, the determined values of the error are used to set the characteristics of a tunable lens (230) so as to correct the error in the vision of the subject. The objective error is measured again while the subject viewing through the tunable lens so set. Objective refraction error is again measured. If the error measured is now within predefined limits, the first measurement is deemed correct and the values are out put so that glasses with those values may be prescribed to the subject.

Abstract: This disclosure discloses an apparatus and method thereof for a comprehensive visual function testing apparatus. A plurality of visual test stimuli may be spatiotemporally sequenced and presented to the subject undergoing visual function tests including, but not limited to, visual acuity test, stereoscopic vision test, field of vision test and contrast sensitivity test. Furthermore, by combining all the elements under the same computational device, it streamlines the conventional visual function testing process, provides automated visual function testing of subjects, and refraction correction when required, such as for perimetry testing. Such an apparatus opens up unprecedented possibilities for refining the visual function testing process. High degree of integration resulting from adoption of the features disclosed, a variety of compact, portable, wearable embodiments may be achieved.