An apparent failure of the photoreceptor alignment mechanism in a human observer
H. E. Bedell and J. M. Enoch
Using the psychophysical Stiles-Crawford function, the orientation of the
retinal photoreceptors was shown to be directed toward a region near the
center of the eye rather than the pupil in one eye of a human observer.
Since an observable pathologic condition was not present, this eye was
concluded to represent the first demonstrated instance of a primary global
disturbance of the normal receptor alignment mechanism. The examination of
this unique observer permits the visual importance of normal receptor
orientation to be assessed and allows potential photoreceptor alignment
mechanisms to be evaluated.