Which instrument is used to examine the interior of the human eye?
Fundus (eye) ophthalmoscope allows observation of blood vessels with diameters as small as 10 μm. Fundus (eye) The fundus of the eye is the interior surface of the eye opposite the lens and includes the retina, optic disc, macula, fovea, and posterior pole. The fundus can be examined by ophthalmoscopy and/or fundus photography. The term "fundus" may also be inclusive of Bruch's membrane and the choroid. The color of the fundus varies both between and within species. In one study of primates the retina is blue, green, yellow, orange, and red; only the human fundus (from a lightly pigmented blond person) is
Eye movement in reading vision, and oculomotor control. Eye trackers bounce near infrared light off the interior of the eyeball, and monitor the reflection on the eye to determine gaze location. With this technique, the position of a fixation on a screen can be precisely determined. Wang (2011) mentioned that a video-based eye-tracker which uses video cameras to record the eye position of human subjects—recording pupil dilation and eye movement—can be used to examine how fixations, saccades, and pupil dilation responses are related to the information on the screen and behavioral choices. According to Wang (2011:185), "understanding the relationship between these observables can help