The ultrastructure of the retina showed extensive and severe degeneration in the photoreceptors,parti cularly in outer segments and mitochondrias. Lipofuscin granules were accumulated in the cytoplasm.

• 感光细胞的超微结构有明显变性改变，尤以外节变性、线粒体变性、胞浆内脂褐素沉着为突出。