System and method for measurement of refractive error of an eye based on subjective distance metering

A computing device to measure at least one refractive error of an eye of a subject, the computing device comprising:

• a display configured to display at least one target image over a display area;
• an interface to output to said subject an instruction to change a distance between said eye and said display area until the subject is able to clearly recognize one or more visual elements of said target image using said eye, said interface to receive feedback of the subject to indicate a subject-specific distance between the eye of the subject and said target image, which is to enable said subject to clearly recognize the one or more visual elements of said target image using said eye;
• a sensor to sense data representing said subject-specific distance;
• and
• a refractive error processing component to trigger an estimation of said subject-specific distance, and to trigger a calculation of at least one parameter associated with the refractive error of the eye based on said subject-specific distance and said target image.

A method, to be implemented by a computing device, of providing a measurement of at least one refractive error of an eye of a subject, the method comprising:

• triggering a display of at least one target image over a display area;
• triggering an instruction to the subject to change a distance between the eye of the subject and said display area until the subject is able to clearly recognize one or more visual elements of said target image using said eye;
• receiving feedback of the subject indicating a subject-specific distance between the eye of the subject and said target image, which is to enable said subject to clearly recognize the one or more visual elements of said target image using said eye;
• receiving input data representing said subject-specific distance;
• and
• providing at least one calculated parameter associated with the at least one refractive error of the eye based on said subject-specific distance and said target image.