This is accomplished in part, especially in lower vertebrates, by structural changes within the retina. For many years, largely in collaboration with H.-J. Wagner's laboratory, I have been studying the pathways controlling such changes. T echniques employed include standard light and electron microscopy, and immunocytochemistry. Douglas, R.H . Morphological light adaptation following brief light exposure.
Rods trigger light adaptive retinomotor movements in all spectral cone types of a teleost fish.
The effect of dopamine depletion on light-evoked and circadian retinomotor movements in the teleost retina. The circadian component of spinule dynamics in teleost retinal horizontal cells is dependent on the dopaminergic system. The effect of melatonin agonists and antagonists on horizontal cell spinule formation and dopamine release in a fish retina. We are interested in the distribution, identity and function of these pigments in a wide variety of animals. The identification of 3-hydroxykynurenine as the lens pigment in the gourami, Trichogaster trichopterus.