A new technique for repairing descemet membrane detachments using intracameral gas injection.
ABSTRACT Descemet membrane detachments are not uncommon following cataract surgery, and large and extensive detachments can have an impressive presentation, with severe corneal edema and marked reduction in visual acuity. Traditional treatment regimens have included observation (with the hopes of spontaneous resolution), anterior chamber injections of air or viscoelastic, transcorneal suturing, and even corneal transplantation for persistent cases. During the past few years, intracameral injection with either sulfur hexafluoride (SF6) or perfluoropropane (C3F8) gas has gained increasing acceptance as an efficient and effective treatment option for Descemet membrane detachments. Previously described techniques of gas injection have required corneal and paracentesis incisions; sterile blades, cannulas, and other instruments; and occasionally, an operating room setting. We describe a simple, safe, and effective technique for intracameral gas injection that can be performed by one person at the slitlamp microscope or in a minor operating room with minimal equipment.
Conference Paper: Exact inverter waveform analysis using Z-transform estimation techniques[Show abstract] [Hide abstract]
ABSTRACT: Z-transform approaches do not intrinsically trade off amplitude vs. frequency accuracy, as do Fourier-transform approaches. Thus, exact measurement of both quantities for the relevant harmonics is theoretically possible. However, existing Z-transform estimation methods fail in such applications because of their sensitivity to the colored, nonGaussian noise present in most inverter topologies. An approach to Z-transform estimation is presented that is very insensitive to such colored noise. The approach is developed theoretically and experimental verified on a PC-AT-based signal acquisition system using actual inverter waveforms.Power Electronics Specialists Conference, 1988. PESC '88 Record., 19th Annual IEEE; 05/1988
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ABSTRACT: Cataract surgery has evolved dramatically over the last two decades, largely as a result of technological advances. As a result, visual outcomes and patient convalescence have improved significantly. A second consequence of increased instrumentation and technology, however, is increased complexity of cataract surgery and the advent of complications unique to these advances. Cataract surgeons must be aware and capable of managing the many possible adverse events that can occur during cataract surgery. This review identifies many of the common complications of cataract surgery, describes methods to avoid these complications and discusses techniques to address complications that do occur. It is the ability to avoid, quickly identify, and properly manage complications that defines the accomplished cataract surgeon.Current Opinion in Ophthalmology 03/2003; 14(1):7-19. DOI:10.1097/00055735-200302000-00002 · 2.64 Impact Factor
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ABSTRACT: Descemet's membrane detachment (DMD) is an uncommon condition with a wide range of etiologies. More than likely, the most common cause is a localized detachment occurring after cataract surgery. We report three cases of Descemet's membrane detachment that occurred after uncomplicated phacoemulsification cataract surgeries. The first patient was managed without surgical intervention, the second patient was treated using an intracameral air injection, and the last patient was treated with an intracameral perfluoropropane (C3F8) gas injection. All three patients recovered their vision following the reattachment of Descemet's membrane. The three patients were treated according to the extent of the detachment.Yonsei Medical Journal 11/2005; 46(5):719-23. DOI:10.3349/ymj.2005.46.5.719 · 1.26 Impact Factor