科研之友
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<正>The fovea as the retinal site of the sharpest vision is a pitted invagination at the inner surface of thick retinal areas,which contain high photoreceptor and neuron numbers.There are two basic types of the vertebrate fovea:the fovea of nonmammalian species,which does not contain a foveola and the primate(including human) fovea with a central foveola surrounded by sloping foveal walls.
