Intracorneal rings

Published on 08/03/2015 by admin

Filed under Opthalmology

Last modified 08/03/2015

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CHAPTER 33 Intracorneal rings

Epidemiologic consideration and terminology

Keratoconus is a progressive disorder and usually its progression rate is higher before the fourth decade. The treatment of keratoconus, up to date, was mostly focused on visual rehabilitation. In the future, controlling the progression of the disease will be another important goal for treatment modalities to achieve. This would allow more patients to be in the older ages when the progression of the keratoconus slows down, without significant complication and visual deprivation. Although long-term results with controlled studies are not known, depending on early results, ICRS not only provide better visual quality but also may help in controlling the progression of keratoconus1,2. With the advent of cross-linking, and perhaps with the combination of both modalities, the need for keratoplasty for keratoconus, which has an approximately 20% rejection rate, will decrease. Moreover, it will be possible to help patients with advanced disease with stronger ICRS treatments and state of the art corneal lamellar surgery3.

Post-LASIK ectasia is a rare, but vision threatening complication. The incidence of ectasia after refractive surgery is not known precisely, but has been estimated to be 0.2%–0.66% in two studies. Ectasia can be defined as progressive non-inflammatory corneal thinning after surgery resulting in irregular topographic steepening and resultant irregular astigmatism. Ectasia can occur after any keratorefractive procedure but, for the sake of this chapter, we will be addressing only laser in situ keratomileusis (LASIK) and surface ablation.