![]() ![]() The posterior pole of the sclera is perforated by the optic nerve and this site is marked as the posterior scleral foramen. ![]() The sclera is thickest posteriorly, becoming progressively thinner anteriorly. ![]() The sclera is an opaque, white, outer layer that surrounds the posterior five-sixths of the eyeball. ![]() Although the episcleral potential space exists between the fascia and the eyeball, there is actually very little movement between the eye and the sheath, meaning that the fascia and the eye move together within the orbital fat. The function of the Tenon’s capsule is to protect the eyeball, to position it within the orbit and to allow the actions of the extraocular muscles. While the latter is called the lateral check ligament, and it attaches to the zygomatic bone. The former is called the medial check ligament, and it attaches to the lacrimal bone. The two particularly important tendon sleeves are the one around the tendons of the medial and lateral rectus muscles. These sleeve-like projections are important as they attach to the surrounding structures of the orbit, thus limiting the actions of the extraocular muscles. The tendon of each muscle penetrates the fascial sheath, which reflects back on their tendons, forming a short sleeve around them. The outer surface of the Tenon’s capsule provides the attaching points to the extraocular muscles. The inner surface of the fascia is smooth and is separated from the surface of the sclera by a potential space called the episcleral space. Anteriorly, it attaches to the sclera, while posteriorly it fuses with the meninges that wrap the optic nerve. The Tenon’s capsule is a fascial sheet that forms the socket around the eyeball. The role of refractive structures to bend the direction of the light that falls onto the eye and focus it onto the retina. Together with the cornea and aqueous humor, the vitreous body and lens belong to the refractive media of the eyeball. The inside of the eye contains the two refractive structures of the eye called the lens and vitreous body. These three layers comprise the circular outline of the eyeball. The retina itself is divided into two layers an outer, pigmented layer, and an inner neurosensory layer.
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