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Corneal disorders grouped into: refractive errors due to irregular curvature (myopia, hyperopia, and astigmatism); external eye conditions affecting cornea (allergies, conjunctivitis, Sjogren\'s syndrome); and four main groups of corneal disorders (infections, dystrophies, pterygium, and drug associated conditions such as Stevens-Johnson syndrome). SMQ defined to include corneal disorders with associated specific and selected non specific signs and symptoms involving one or more layers of cornea (epithelium, Bowman\'s membrane, stroma, Descemet\'s membrane, and endothelium).
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