Vision - Structures of the Eye

    This image focuses on the three internal layers of the eye.

    Anatomy of the eye.

  1. The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber.
  2. The sclera, also known as the white of the eye, is the opaque, fibrous, protective, outer layer of the eye containing collagen and elastic fiber.
  3. The choroid is the vascular layer of the eye, containing connective tissue, and lying between the retina and the sclera.
  4. The anterior chamber is the fluid-filled space inside the eye between the iris and the cornea's innermost surface.
  5. The posterior chamber is a narrow space behind the peripheral part of the iris, and in front of the suspensory ligament of the lens and the ciliary processes.
  6. The iris is a thin, circular structure in the eye, responsible for controlling the diameter and size of the pupil and thus the amount of light reaching the retina.
  7. The iris dilator muscle is a smooth muscle of the eye, running radially in the iris and therefore fit as a dilator.
  8. The iris sphincter muscle encircles the pupil of the iris, appropriate to its function as a constrictor of the pupil.
    Anterior part of human eye, with anterior chamber at right.

  9. The ciliary body is a part of the eye that includes the ciliary muscle, which controls the shape of the lens, and the ciliary epithelium, which produces the aqueous humor.
  10. The aqueous humour is a transparent, gelatinous fluid similar to plasma located in the anterior and posterior chambers of the eye.
  11. The canal of Schlemm is a circular lymphatic-like vessel in the eye that collects aqueous humor from the anterior chamber and delivers it into the episcleral blood vessels via aqueous veins.
  12. The crystalline lens is a transparent, biconvex structure in the eye that, along with the cornea, helps to refract light to be focused on the retina.
  13. The ciliary muscle in the eye's middle layer (vascular layer) that controls accommodation for viewing objects at varying distances and regulates the flow of aqueous humour into Schlemm's canal.
  14. The vitreous humour is the clear gel that fills the space between the lens and the retina of the eyeball of humans and other vertebrates.