How many retina is present in our eyes?

Dear student, 

The retina is a component of the inner surface of the eye, it is a tissue layer which is light sensitive. Each eye contains one retina, however the retina, in turn, is made up of two types of photoreceptor cells the rods and cones. Here is an image of the retina attached for reference. 
Hope this information clears your doubts.
Regards

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