The use of Saturn II lenses in keratoconus

We studied Saturn II contact lenses in keratoconus patients who were intolerant to other available contact lenses. A total of 24 patients, who were followed for up to 15 months, participated in the study. Visual acuities improved significantly following fitting with the Saturn II contact lens; whereas only one eye in the series was correctable to 20/20 before fitting, eight eyes were corrected to 20/20 following fitting. A great number of lenses had to be replaced during the study because of deposit formation and tearing at the interface (rate of replacement: 0.52 lenses per eye per month). A variety of complications occurred during lens wear, resulting in only six eyes wearing the Saturn II lens at the close of the study (out of 46 eyes that had started wearing the lens). Discomfort due to tightness of the peripheral segment was the most common cause of lens discontinuation. We conclude that the Saturn II lens was inadequate for fitting patients with advanced keratoconus.     

Use of contact lenses for management of keratoconus

This article describes use of contact lenses to manage patients with keratoconus. Fitting concepts, prefit evaluations, types of lenses, initial lens selection, and potential problems and solutions are discussed.     

Hydrophilic contact lenses for wound stabilization in keratoplasty

Hydrophilic contact lenses may be used in selected cases in which penetrating keratoplasty is complicated by partial wound dehiscence and anterior slippage of the donor tissue. We report five cases and describe a technique in which, rather than resuturing, a soft contact lens is used as a corneal stent to realign the graft-host interface. This technique allows for non-surgical correction of a potentially serious complication, with preservation of good vision during the treatment period. In the present series, no serious complications were encountered, and all wounds were adequately reapposed. Successful application of this technique requires appropriate patient selection and careful monitoring during the course of treatment.     

Bilateral keratoconus: a case report

Among corneal dystrophies, the keratoconus is one of the most frequently observed among young adults. A clinico pathological case is reported in a 13-year-old-girl of African origin. The diagnosis of bilateral keratoconus was established based on the obvious changes of the corneal curvature and thickness. After an unsuccessful attempt to improve vision with contact lenses, a keratoplasty was finally performed on one side to remove the pathological cornea. Its histopathological study found the characteristic changes of keratoconus: breaks of Bowman's layer and corneal thinning.     

Correction of keratoconus with rigid gas-permeable contact lenses

This study analyzed the feasibility of fitting keratoconus-affected corneas with nonkeratoconus rigid gas-permeable (RGP) contact lenses. We retrospectively studied patients with a diagnosis of keratoconus in the past 10 years who were fitted successfully with nonkeratoconus RGP lenses by the same physician. Results confirmed nonkeratoconus RGP lenses as the first-line correction tool. Additionally, we found a simple equation to speed the choice of the base curves of the lenses. The authors have stated that they do not have a significant financial interest or other relationship with any product manufacturer or provider of services discussed in this article.     

RGPCL矫治圆锥角膜长期临床观察

目的观察RGPCL矫治圆锥角膜的长期临床应用效果。方法回顾性研究。以2005-2009年间在沈阳爱尔眼科医院视光中心因圆锥角膜验配RGPCL患者为研究对象,共260例（496眼）。男212例,女48例。所有患者随访观察时间至少4年。评估RGPCL镜片配适状态,对配戴框架眼镜和RGPCL的矫正视力,配戴RGPCL前后圆锥锥顶K值及角膜厚度进行比较,观察角膜曲率的变化及并发症的发生情况。数据采用配对t检验进行分析。结果所有病例配戴RGPCL初期获得满意的矫正视力,框架眼镜矫正视力与RGPCL比较差异有统计学意义（t=-25.55,P<0.05）。4年后,框架眼镜矫正视力与RGPCL矫正视力差异有统计学意义（t=-30.02,P<0.05）。配戴RGPCL前及4年后圆锥锥顶K值比较差异有统计学意义（t=3.02,P＜0.05）,圆锥锥顶厚度比较差异无统计学意义（t=1.46,P＞0.05）。432眼（87.1％）的配适状态为三点接触,46眼（9.3％）为顶点充盈,18眼（3.6％）为可接受的顶点接触。角膜曲率变化情况为,仅3眼（0.6%）陡峭角膜曲率值增加,64眼（12.9%）扁平角膜曲率值增加。随访期间,所有病例均未弃戴,33眼（6.6％）出现角膜上皮点状着染,未发现角膜缘新生血管,无角膜溃疡等严重并发症。结论圆锥角膜患者配戴RGPCL能获得满意的矫正视力,能延缓圆锥角膜发展,且无严重并发症发生。     

Optical correction of keratoconus by soft contact lenses

Soft contact lenses have been used in 41 patients (71 eyes) aged 10-50 years with uni- and bilateral keratoconus. In 46 eyes (64.8 p.c.) application of soft contact lens enabled visual acuity of 5/5 to 5/25, mainly in initial or intermediate phases of keratoconus. In these cases correction with soft contact lenses gave better results than after application of ++sphero-cylindrical spectacles. In far advanced keratoconus one can observed better visual acuity after application of soft contact lenses in comparison with spectacles correction. However correction with hard contact lenses was the best one.