Retinal polarization effects.
Retinal photographs taken with crossed polarizers in the input and recording light paths show a cross or brush pattern overlying the macula. Experiments were done indicating that this pattern is due to the birefringence in cone-photoreceptor outer segments. Haidinger's brushes are also attributed to cone outer segments, but the effect is due to a combination of the dispersion in the birefringence and the dichroism of the outer segments. The objective, polarized-light retinal pattern is shown to be a useful clinical tool for diagnosing diseases affecting the macula.
Hochheimer
B F
BF
Johns Hopkins University, Applied Physics Laboratory, Laurel, Maryland 20707, USA.
Kues
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HA