Text-book of ophthalmology . o the interspace between it and the ciliary processes, and thusadmit a great quantity of irregularly refracted rays into the eye. In orderto make the coloboma narrow and not too peripheral, the incision must beshort, and lie at, or even inside of, the limbus. Those cases constitute anexception to this rule, in which only the most exterior marginal portion ofthe cornea has remained transparent, so that the iridectomy must, forobvious reasons, be quite peripheral. That spot is chosen as the site of the coloboma at which the media arethe most transparent. Wherever pos
Text-book of ophthalmology . o the interspace between it and the ciliary processes, and thusadmit a great quantity of irregularly refracted rays into the eye. In orderto make the coloboma narrow and not too peripheral, the incision must beshort, and lie at, or even inside of, the limbus. Those cases constitute anexception to this rule, in which only the most exterior marginal portion ofthe cornea has remained transparent, so that the iridectomy must, forobvious reasons, be quite peripheral. That spot is chosen as the site of the coloboma at which the media arethe most transparent. Wherever possible, we avoid making the colobomaabove, as in that case it would be partly covered by the lid. If the mediaare everywhere equally transparent (as when there is a cicatrix situatedexactly in the center of the cornea, a pupillary membrane, or a perinuclearcataract), the iridectomy is performed downward and inward (Fig. 446),because in most eyes the visual axis cuts the cornea a little to the inner sideof the apex (pag3 766)..
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