The blind spot is where all the nerves gather to go off to the brain. The fovea is the center of your visual field. The highest density of photoreceptors can be found in the fovea. The fovea is the spot where the optical axis (center of the lens) impinges on the retina.The retina is the surface of the inside of the eye, which is covered with light-sensitive receptor cells.Under muscle control, it can move forward and backward, and also get thinner or fatter to change its focal length. It opens in dim light, and closes in bright light. The iris opens and closes the pupil depending on the intensity of light. It is an opaque muscle, with a hole in the center called the pupil that lets light through to fall on the lens. The iris is the colored part of the eye, which covers the lens.The aqueous humor fills the cavity between the cornea and the lens, and provides most of the optical power of the eye because of the large difference between its refractive index and the refractive index of the air outside the cornea.
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