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  2. Fovea
    • In the human eye the term fovea (or fovea centralis) denotes the pit in the retina which allows for maximum acuity of vision.
    • (In the human fovea the ratio of ganglion cells to photoreceptors is close to one; almost every photoreceptor has one ganglion cell receiving data from it. That is why it has little loss of sensory data, thus it is the area of the eye where most details can be seen)
  3. Aqueous humor
    • In medicine, humor refers to a fluid (or semi fluid) substance. Thus, the aqueous humor is the fluid normally present in the front and rear chambers of the eye. It is a clear, watery fluid that flows between and nourishes the lens and the cornea; it is secreted by the ciliary processes. [Vitreous humor – the jelly one between retina and the lens]
  4. Choroid
    The choroid is the vascular layer containing connective tissue, of the eye lying between the retina and the sclera. It contains blood vessels and pigment. In humans its thickness is about 0.5 mm, and it’s usually black. The choroid provides oxygen and nourishment to the outer layers of the retina. Along with the ciliary body and iris, the choroid forms the uveal tract.
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