KERATECTOMY 



639 



KERATODERMATITIS 



of the cornea, after 1"-- of the -uj ><rt"icial lamina. It 

 differs from staphyloma in the absence of perforation, 

 and in the non-invoh ement of the iris. 



Keratectomy [ker-at-ek' '-to-me) [ pag, horn, cornea ; 

 EKTOfif], a cutting out]. Surgical excision of a part of 

 the cornea. 



Keratiasis [ker-at-i' '-as-is) [/c£pac, horn], A morbid 

 condition characterized by the growth oi horny excres- 

 cences. 



Keratic [ker-at' ik) [/cepac, horn]. Horny. 



Keratin [ker' '-at-in) [/e£pac, hornj. The basis of horny 

 tissues, hair, nails, feathers, etc. It is a mixture of 

 various complex substances. Decomposed, it yields 

 leucin and tyrosin. It is used in pharmacy. 



Keratinian {ker-at-in'-e-an) \jdpag, horn]. Relating 

 to keratin or to the cornea. 



Keratinization [ker-at-in-iz-a'-skun) [icipag, horn]. 

 i. The development of a horny quality in a dssue. 

 2. The coating of pills with keratin. 



Keratitis {ker-at-i' '-tis) [<■ rnea ; ing, inflamma- 



tion]. Inflammation of the cornea. K., Asthenic. 

 See A", Phlyctenular. K., Astigmatic, a form of 

 keratitis said to be due to uncorrected astigmatism. K. 

 bullosa, the formation of large or small blebs upon 

 the cornea of an eye, the seat of iridocyclitis, inter- 

 stitial keratitis, or glaucoma. K., Circumscribed, 

 limited to a part of the cornea. K. contagiosa, a 

 contagious, suppurative variety occurring in cattle. 

 K., Cretaceous, a calcareous infiltration of the cor- 

 neal epithelium. K., Deep. See A", profunda. 

 K., Diffuse. See JC., Interstitial. K., Dotted. See 

 K. punctata. K., Fascicular, a form of phlyctenular 

 keratitis in which one of the ulcers, originally formed 

 at the margin of the cornea, creeps across its sur- 

 face, followed by a leash of distended blood-vessels. 

 K., Granular, due to conjunctival granulations ; 

 pannus. K., Herpetic, characterized by the forma- 

 tion of small vesicles on the cornea, which ulcerate 

 and then heal. Relapses are common. K., Hypo- 

 pyon, an ulcerative form accompanied by the forma- 

 tion of pus in the anterior chamber. K., Inherited. 

 See A'., Interstitial. K., Interstitial, a form of 

 keratitis in which the entire cornea is invested with a 

 diffuse haziness, almost completely hiding the iris. 

 The surface of the cornea presents a ground-glass 

 appearance. Later, from ciliary injection, blood-ves- 

 sels form in the superficial layers of the cornea, and 

 produce a dull-red color, the " salmon patch " of 

 Hutchinson. The entire cornea may become cherry- 

 red. The disease is most frequent between the ages 

 of five and fifteen, and occurs in syphilitic individ- 

 uals. K. maculosa. See A', superficialis punc- 

 tata. K., Marginal, a form of phlyctenular keratitis 

 in which the phlyctenules are arranged around the 

 margin of the cornea. K. marginalis, a rare form 

 of keratitis that must not be confounded with the 

 marginal form of phlyctenular keratitis. It occurs in 

 elderly people, and consists of a yellowish-gray zone 

 of opacity immediately joining the sclera, which pushes 

 into the clear cornea and occupies about one-half the 

 circumference. K. neuroparalytica, keratitis fol- 

 lowing paralysis of the fifth nerve. It does not 

 usually occur in partial paralysis of the nerve. Its 

 cause is loss of trophic influence, aided by mechanical 

 irritation and drying of the cornea. K. of Reapers, 

 a traumatic form due to irritation of the corneas of 

 reapers by beards of grain. K. pannosa, a superfi- 

 cial form in which blood-vessels develop beneath and 

 in the epithelium. The latter undergoes hyperplasia 

 and becomes in part opaque. K., Parenchymatous. 

 See A", Interstitial. K., Phlegmonous. See K. 

 purulenta. K., Phlyctenular, a disease of the eye 



characterized by the formation upon some portion of 

 the cornea of .-.mall papules or pustules, often asso- 

 ciated with the formation of a similar lesion upon the 

 ijunctiva. It is marked by much local congestion, 

 lacrymation, and intense photophobia. The papules 

 maj p into ulcers. K. profunda, an unusual 



form ol keratitis characterized by the formation of a 

 gray opacity in the (inter of the coi rered by 



superficial and stippled corneal layers. K. punctata. 

 I. tion of (lie cornea in association 



with affections of the iris, choroid, and vitreous. It is 

 characterized by the formation of opaque dots, gener- 

 ally arranged in a triangular manner upon the poste- 

 rior ela-tic lamina of the cornea. It is sometimes des- 

 ignated as Descemetitis. 2. Also a term given to an 

 inflammatory affection of the cornea in which isolated 

 white spots appear in Descemet's membrane, sur- 

 rounded by cloud\ area-. It oci urs in children before 

 pul" I is probably syphilitic. K. purulenta, 



accompanied by the formation of pus. K., Pustular. 

 See A'., Phlyctenular. K., Rheumatic, occurring in a 

 rheumatic subject. K., Ribbon-like, a nam.- applied 

 to the formation of a transverse calcareous film on "the 

 cornea, especially in elderly people. It is usually 

 symmetric, and occurs chiefly in men of the gouty 

 diathesis. K. scrofulosa. See K., Interstitial. K., 

 Secondary, due to disease of other parts. K., Spe- 

 cific. See A", Interstitial. K., Strumous. Sw A'., 

 Phlyctenular, and A'., Interstitial. K. subepithelial 

 centralis. See A', superficialis punctata. K. su- 

 perficialis punctata, a disease of the cornea a 

 ciated with severe conjunctivitis and with catarrh of the 

 respiratory tract. In two or three days punctiform or 

 linear spots appear immediately beneath the epithe- 

 lium, the overlying conjunctiva being slightly hazy. It 

 is also called A", subepithelialis centralis, and A", macu- 

 losa. K. suppurativa. See A", purulenta. K., 

 Sympathetic, that following inflammation of the 

 other eye. K., Syphilitic. See A", Interstitial. 

 K. taenulosa. See A'., Phlyctenular. K., Trach- 

 omatous. See Pannus. K., Traumatic, that conse- 

 quent upon wounds or other injury of the cornea. K. 

 ulcerosa, a form in which one or more ulcers involv- 

 ing part of the cornea are present. K. variolosa, that 

 occurring in smallpox. It is purulent and often arises 

 from a corneal pustule. K., Vascular, a superficial 

 vascularity of the cornea occurring in pannus, etc. 

 K., Vesicular. See A", Phlyctenular. 



Keratocele [ker' -at-o-sel) \jdpag, cornea; hi/'///, tumor]. 

 A hernia of Descemet's membrane through the cornea. 



Keratochromatosis [ker-at-o-kro-mat-o' -sis) [a 

 horn; ^pty/a, color]. Discoloration of the cornea. 



Kerato-conjunctivitis [ker* ' -at-o-kon-junk-tiv-i* '-tis) 

 [xlpac, horn, cornea ; conjnnctivus , connecting ; n . 

 inflammation]. Simultaneous inflammation of the 

 cornea and the conjunctiva. 



Kerato-conometer [ker-at-o-ko-nom'-et-er) [/ccpac, 

 cornea; Kuvog, cone; u teasure]. An instru- 



ment for estimating astigmatism by the images reflected 

 from the cornea. 



Keratoconus {ker-at-o-ko* -nus). See Keratoglobus. 



Keratode [ker' -at-od) [i&pag, horn; eldog, like]. The 

 horny substance composing the skeleton of certain 

 sponges. 



Keratodeocele {ker-at-od' '-e-o-sit). See Keratocele. 



Keratodeonyxis [ker-at-od-e-o-niks / -is). See Kerat- 

 onyxis. 



Keratoderma (ker-at-o-dcr' '-mah) Vicipag, horn ; Aepfia, 

 skin]. I. The cornea. 2. A horny condition of the skin. 



Keratodermatitis [ker-at-o-der-mat-i'-tis) \japag, horn ; 

 . -kin ; trtg, inflammation]. Inflammation of 

 the keratoderma; keratitis. 



