Vincent K C Chan

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It is well known that parallel manipulators may encounter singular configurations that can result in a loss of full constraint. The nature of the kinematic deficiency at such a singular configuration can be analyzed by calculating the nullspace of the Jacobian matrix at that configuration. The result is a set of one or more screws, called the EE deficiency(More)
PURPOSE To report the early experience and complications during cataract surgery with a noncontact femtosecond laser system. SETTING Hong Kong Sanatorium and Hospital, Hong Kong Special Administrative Region, China. DESIGN Retrospective case series. METHODS All patients had anterior capsulotomy or combined anterior capsulotomy and lens fragmentation(More)
Purpose. To report visual outcomes and patient satisfaction after unilateral or bilateral refractive lens exchange (RLE) with a single-piece bifocal diffractive multifocal intraocular lens (MIOL). Methods. All patients underwent RLE with the ZMB00 MIOL (Abbott Medical Optics). Patient charts were reviewed to evaluate the distance, intermediate, and near(More)
PURPOSE To compare the refractive and visual outcomes between 2 ablation centration points, 80% and 100% from the pupil center toward the coaxially sighted corneal light reflex. SETTING Hong Kong Sanatorium and Hospital, Hong Kong, China. DESIGN Retrospective comparative study. METHODS All eyes had myopic laser in situ keratomileusis with the ablation(More)
Background. The vision with diffractive toric multifocal intraocular lenses after cataract surgery in long eyes has not been studied previously. Objectives. To report visual performance after bilateral implantation of a diffractive toric multifocal intraocular lens in high myopes. Methods. Prospective, observational case series to include patients with(More)
Purpose. To report visual performance and quality of life after implantation of a bifocal diffractive multifocal intraocular lens (MIOL) in postmyopic laser in situ keratomileusis (LASIK) patients. Methods. Prospective, observational case series. Patients with prior myopic LASIK who had implantation of Tecnis ZMA00/ZMB00 MIOL (Abbott Medical Optics) at Hong(More)
PURPOSE To report visual outcomes and complications after cataract surgery in nanophthalmic eyes with a phacoemulsification system using the active fluidics control strategy. METHODS This is a retrospective case series. All eyes with an axial length of less than 20 mm that underwent cataract surgery or refractive lens exchange using the Centurion Vision(More)
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