Text-book of ophthalmology . h it gives rise often causes acondition of irritation in the eye, as is shown by the marked injection andsucculence (catarrhal inflammation) of the pterygium itself. In addition,the membrane, particularly if very much reddened, forms a striking disfig-urement and can also cause a restriction of the mobility of the eye. If, forexample, a pterygium is situated on the inner side of the cornea and the eyeis meant to be turned strongly outward, the eye may be restrained in its DISEASES OF THE CONJUNCTIVA 215 movement by the tension of the pterygium, and therefore fail t
Text-book of ophthalmology . h it gives rise often causes acondition of irritation in the eye, as is shown by the marked injection andsucculence (catarrhal inflammation) of the pterygium itself. In addition,the membrane, particularly if very much reddened, forms a striking disfig-urement and can also cause a restriction of the mobility of the eye. If, forexample, a pterygium is situated on the inner side of the cornea and the eyeis meant to be turned strongly outward, the eye may be restrained in its DISEASES OF THE CONJUNCTIVA 215 movement by the tension of the pterygium, and therefore fail to move lat-erally as far as the other or healthy eye, so that binocular diplopia may beproduced in consequence of this faulty placing. The older writers distinguished a pterygium crassum (vasculosum, carnosum,sarcomatosum) and a pterygium tenue (membranaceum). The former corresponds toa catarrhally inflamed, and hence therefore red and thick pterygium, the latter to astationary pterygium, which has become thin and Fig. 61.—Longitudinal Section through a Pterygium. Magnified 12 X apex of the pterygium is marked by the termination of Bowmans membrane at m. At pis theboundary between the epithelium of the conjunctiva and of the cornea. At b, bi, fen, lie cavities linedwith epithelium. These are the cross sections of spaces which jut in from the lateral margin of thepterygium, between the latter and the surface of the cornea, and which are divided by the sectionclose to their blind extremity. Beneath them at mi are to be seen remains of Bowmans eye had a wide pupil, consequently the iris in the section looks short and thick; its pupillary por-tion rises abruptly from the anterior capsule of the lens and indeed actually is overhanging so as toconceal the retinal pigment layer of the iris (compare p, Fig. 142). Conspicuously visible on the anteriorsurface of the iris are the very protuberant contraction folds, /, also the orifice of a crypt, c, and la
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