Cases with equivocal findings should also be regularly monitored for any signs of progression. These conditions will incompletely fulfill the diagnostic criteria of progressive corneal steepening associated with corneal thinning and posterior and/or anterior elevation. Less commonly encountered conditions are hyperopic laser in-situ keratomileusis and photorefractive keratectomy, ocular rosacea, vernal keratoconjunctivitis and eye rubbing, and blepharoptosis. Irwin Azman, Keratoconus Specialists in Maryland, prescribes scleral contact lenses for a variety of hard-to-fit eyes, including patients with Stevens-Johnson Syndrome, Radial Keratotomy and Lasik Complications and Lasik failures, keratoconus, Corneal Ectasia, Post-Surgical Vision Loss, and Pellucid Marginal Degeneration. The latter includes contact lens–induced corneal warpage, measurement artifacts, corneal scars, high, asymmetric, or irregular astigmatism, tear film instability, and dry eye. The former includes pellucid marginal degeneration, keratoglobus, and corneal ectasia after refractive surgery. Protrusion of the cornea occurs above a band of thinning, which is located 1 to. ![]() These can be classified into ectatic and nonectatic disorders. Pellucid marginal degeneration of the cornea is a bilateral, clear, inferior, peripheral corneal-thinning disorder. ![]() This chapter aims to highlight other conditions that may be confused with keratoconus. ![]() Newer diagnostics that can help identify ectatic disease earlier include epithelial mapping and corneal biomechanical analysis. The accurate diagnosis of keratoconus involves careful analysis of the patient’s medical and family histories, slit lamp biomicroscopic examination, and corneal tomography.
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