1. A handheld computing device for providing a screening test for a subject's left eye and right eye, the computing device comprising: an image capturing device; a light generating device; a display; a data storage comprising an image capturing application including programming data configured to display a mask comprising a left eye frame and a right eye frame on the display, the mask having a mask orientation configured to facilitate positioning the computing device to align, on the display, the left eye frame and the right eye frame of the mask with the left eye and the right eye of the subject, respectively, and the mask having a desired distance spacing the left eye frame and the right eye frame apart from each other, the desired distance configured to facilitate positioning the light generating device at a working distance from the left eye and the right eye by simultaneously positioning, on the display, a selected portion of the left eye within the left eye frame of the mask and a selected portion of the right eye within the right eye frame of the mask to align an inter-eye distance of the subject with the desired distance between the left eye frame and the right eye frame; and a processor operatively coupled to the image capturing device, the light generating device, and the display, the processor being operative to execute the image capturing application to perform an eye test by: displaying the mask overlaying a current image of the image capturing device on the display, operating the light generating device to illuminate the subject's eyes; capturing an image containing both the left eye and right eye at the working distance when the subject's eyes are illuminated, the computing device is positioned to align the left eye frame and the right eye frame of the mask with the left eye and the right eye of the subject, respectively, at the mask orientation, and the inter-eye distance is aligned with the desired distance in the mask using the image capturing device; displaying the captured image on the display for inspection by the operator; analyzing the captured image to provide information regarding the presence or absence of an eye condition; and displaying the results of the analysis on the display of the computing device.