View source for Blood–ocular barrier

The blood–ocular barrier is a barrier created by endothelium of [[Capillaries|capillaries]] of the [[Retina|retina]] and [[Iris_(anatomy)|iris]], [[Ciliary_body|ciliary epithelium]] and [[Retinal_pigment_epithelium|retinal pigment epithelium]]. <span style="visibility: hidden;font-size:1px">Blood–ocular barrier_sentence_0</span>

It is a physical barrier between the local [[Blood_vessel|blood vessels]] and most parts of the [[Human_eye|eye]] itself, and stops many substances including [[Drug|drugs]] from traveling across it. <span style="visibility: hidden;font-size:1px">Blood–ocular barrier_sentence_1</span>

Inflammation can break down this barrier allowing drugs and large molecules to penetrate into the eye. <span style="visibility: hidden;font-size:1px">Blood–ocular barrier_sentence_2</span>

As the inflammation subsides, this barrier usually returns. <span style="visibility: hidden;font-size:1px">Blood–ocular barrier_sentence_3</span>

It consists of the following components: <span style="visibility: hidden;font-size:1px">Blood–ocular barrier_sentence_4</span>

<span style="visibility: hidden;font-size:1px">Blood–ocular barrier_unordered_list_0</span>
<ul>
<li>Blood–aqueous barrier: the ciliary epithelium and capillaries of the iris. Blood-aqueous barrier is formed by nonpigmented ciliary epithelial cells of the ciliary body and endothelial cells of blood vessels in the iris.<span style="visibility: hidden;font-size:1px">Blood–ocular barrier_item_0_0</span></li>
<li>[[Blood%E2%80%93retinal_barrier|Blood–retinal barrier]]: non-fenestrated capillaries of the retinal circulation and [[Tight-junction|tight-junctions]] between retinal epithelial cells preventing passage of large molecules from [[Choriocapillaris|choriocapillaris]] into the retina. Formed by endothelium of retinal vessels and epithelium of retinal pigment.<span style="visibility: hidden;font-size:1px">Blood–ocular barrier_item_0_1</span></li>
</ul>
== See also <span style="visibility: hidden;font-size:1px">Blood–ocular barrier_section_0</span> ==

<span style="visibility: hidden;font-size:1px">Blood–ocular barrier_unordered_list_1</span>
<ul>
<li>[[Blood%E2%80%93air_barrier|Blood–air barrier]] – Membrane separating alveolar air from blood in lung capillaries<span style="visibility: hidden;font-size:1px">Blood–ocular barrier_item_1_2</span></li>
<li>[[Blood%E2%80%93brain_barrier|Blood–brain barrier]] – Semipermeable capillary border that allows selective passage of blood constituents into the brain<span style="visibility: hidden;font-size:1px">Blood–ocular barrier_item_1_3</span></li>
<li>[[Blood%E2%80%93retinal_barrier|Blood–retinal barrier]] – Part of the blood–ocular barrier that prevents certain substances from entering the retina<span style="visibility: hidden;font-size:1px">Blood–ocular barrier_item_1_4</span></li>
<li>[[Blood%E2%80%93testis_barrier|Blood–testis barrier]] – A physical barrier between the blood vessels and the seminiferous tubules of the animal testes<span style="visibility: hidden;font-size:1px">Blood–ocular barrier_item_1_5</span></li>
<li>[[Blood%E2%80%93thymus_barrier|Blood–thymus barrier]] – A barrier formed by the continuous blood capillaries in the thymic cortex<span style="visibility: hidden;font-size:1px">Blood–ocular barrier_item_1_6</span></li>
</ul>


<span style="font-size:65%">Credits to the contents of this page go to the authors of the corresponding Wikipedia page: en.wikipedia.org/wiki/Blood–ocular barrier.</span>