| http://www.w3.org/ns/prov#value | - As will be described below, in some applications, other types of detectors may be desirable. [0044] As shown in FIG. 7A, when the user's eye is positioned so that light from the sources 74, 92 enters the pupil (i.e., when the eye is positioned as shown in FIG. 4), a central region 100 of the detector 98 receives a low level of light from the imaging optics 78.
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