| RAS | rapid atrial stimulation; recurrent aphthous stomatitis; reflex activating stimulus; reliability, av... |
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| RBD | recurrent brief depression; relative biological dose; right border of dullness |
| RCDA | recurrent chronic dissecting aneurysm |
| rec | fresh [Lat. recens]; recessive; recombinant chromosome; record; recovery; recurrence, recurrent |
| recur | recurrence, recurrent |
| corneal reflex | A contraction of the eyelids when the cornea is lightly touched with a camel-hair pencil. Synonym: lid reflex. Reflection of light from the surface of the cornea. (05 Mar 2000) |
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| corneal space | One of the stellate space's between the lamellae of the cornea, each of which contains a cell or corneal corpuscle. Synonym: lacuna. (05 Mar 2000) |
| corneal spot | A moderately dense opacity of the cornea. Synonym: corneal spot. (05 Mar 2000) |
| corneal staphyloma | A bulging near the anterior pole of the eyeball. Synonym: corneal staphyloma. (05 Mar 2000) |
| corneal stroma | The lamellated connective tissue constituting the thickest layer of the cornea between the bowman and descemet membranes. (12 Dec 1998) |
| corneal topography | Measurement of the anterior surface of the cornea, its curvature and shape. It is used often to diagnose keratoconus and other corneal diseases, and corneal changes after keratotomy and keratoplasty. A significant application is in the fitting of contact lenses. In performing corneal topography, many different techniques can be employed: keratometry, keratoscopy, photokeratoscopy, profile photography, computer-assisted image processing, etc. (12 Dec 1998) |
| corneal transplant | A surgical procedure to replace a damaged cornea with a healthy one from a donor's eye. Unlike transplantation of most other organs, the cornea tends to have a problem with transplant rejection. Corneal transplants are indicated in cases of severe corneal injury or corneal infection (corneal ulcer) which has left the cornea scarred. (27 Sep 1997) |
| corneal transplantation | Partial or total replacement of the cornea from one human or animal to another. (12 Dec 1998) |
| corneal trepanation | corneal transplant |
| corneal ulcer | An infectious process of the cornea, resulting in clouding of the cornea, marked eye pain and decreased vision. See: Herpes simplex keratitis. (27 Sep 1997) |
| Salzmann's nodular corneal degeneration | Large and prominent nodules of a solid, opaque material that stands out from the surface of the cornea; occurs occasionally in persons previously affected by phlyctenular keratitis. (05 Mar 2000) |
| serpiginous corneal ulcer | Serpentine ulceration of the cornea, due to infection, most often with Streptococcus pneumoniae. (05 Mar 2000) |
| dendritic corneal ulcer | Keratitis caused by herpes simplex virus. (05 Mar 2000) |
| endothelium, corneal | Single layer of large flattened cells covering the surface of the cornea. (12 Dec 1998) |
| epithelium, corneal | The outer epithelial layer of the cornea, consisting of stratified squamous epithelium continuous with that of the conjunctiva. (12 Dec 1998) |