What does ora serrata mean?

The ora serrata is the peripheral termination of the retina and lies approximately 5 mm anterior to the equator of the eye. The ora serrata is approximately 2 mm wide and is the site of transition from the complex, multilayered neural retina to the single, nonpigmented layer of ciliary epithelium.

What muscle is inserted in the ora serrata?

lateral rectus
The ora serrata defined a plane that angled through the spiral of Tillaux (Fig 7), intersecting the spiral approximately at the lateral rectus insertion and emerging posterior to the medial rec- tus insertion. The lateral rectus is therefore the most useful muscle clinically as a guide to the ora’s location.

What color is ora serrata?

The amount of pigment contained in the iris determines eye colour. When there is very little pigment, the eye appears blue. With increased pigment, the shade becomes deep brown to black.

What are pars plicata?

The pars plicata is the portion of the ciliary body that is responsible for producing aqueous humor, the fluid of the anterior chamber. The production of too much aqueous humor, or reabsorption that occurs too slowly, can lead to increases in the pressure within the eye.

Why is the ora serrata important?

The ora serrata is the serrated junction between the retina and the ciliary body. This junction marks the transition from the simple non-photosensitive area of the retina to the complex, multi-layered photosensitive region.

What is the function of the macula in the human eye?

The macula is located near the center of the retina; its function is to process harp, clear, straight-ahead vision. The retina is the paper-thin tissue that lines the back of the eye and contains the photoreceptor (light sensing) cells (rods and cones) that send visual signals to the brain.

How far is the pars plana from the limbus?

3.0 mm
Thus, the correct indicator of the distance from the posterior surgical limbus is 2.5 mm in ab interno ciliary sulcus suture fixation of IOL using straight needle and 3.0 mm in pars plana fixation of IOL.

What are the layers of the fovea?

The foveal pit now contains a very thin, only one layer thick, ganglion cell layer, a thin inner plexiform layer (IPL) but a prominent inner nuclear layer (INL) (Figure 10, a).

What is between the cornea and the iris?

Anterior chamber – the fluid-filled space between the cornea and iris.

Is pars plicata part of uvea?

The uvea consists of three components: iris, ciliary body, and choroid. The ciliary body is a band of tissue approximately 6 or 7 mm wide (in adult humans) located between the iris and sclera. It is divided into two parts: a thicker body (pars plicata) anterior to a flatter body (pars plana).

What is the ciliary body in contact with?

The internal surface of the ciliary body comes in contact with the vitreous surface and is continuous with the retina [1].

What does the ora serrata look like?

The ora serrata is the serrated junction between the choroid and the ciliary body. This junction marks the transition from the simple, non-photosensitive area of the ciliary body to the complex, multi-layered, photosensitive region of the retina….

What is the medical definition of the pars plana?

pars plana. noun. pars pla·​na | \\ˈpärs-ˈplā-nə, ˈpärz-\\. : the posterior part of the ciliary body extending from the pars plicata to the ora serrata. — called also ciliary ring, orbiculus ciliaris.

What is the ora serrata in the eye?

Ora serrata. Diagram of the blood vessels of the eye, as seen in a horizontal section. The ora serrata is the serrated junction between the retina and the ciliary body. This junction marks the transition from the simple, non-photosensitive area of the ciliary body to the complex, multi-layered, photosensitive region of the retina.

How did pars plana vitrectomy get its name?

Pars plana vitrectomy (PPV) is a commonly employed technique in vitreoretinal surgery that enables access to the posterior segment for treating conditions such as retinal detachments, vitreous hemorrhage, endophthalmitis, and macular holes in a controlled, closed system. The procedure derives its name from the fact that vitreous is removed (i.e.

How are soft lenses removed from pars plana?

For pars plana lensectomy, soft lenses can be removed using the vitrectomy cutter, but denser lenses may require use of the fragmatome. The fragmatome operates similarly to a phacoemulsification probe although use of the conventional fragmatome requires enlarging sclerotomies, often using an MVR blade.