Evolving from the initial experiments [1,2], the study of atom focusing using standing wave (SW) light fields has developed into a broad area of research in atom optics. A standing wave field acts as a lens as a result of a spatially-dependent light shift, focusing atoms into a periodic set of lines or dots having widths of the order of tens of nanometers and distanced from one another by λ/2, ...

We demonstrate a variable focal length achromatic lens that consists of a flat liquid crystal diffractive lens and a pressure-controlled fluidic refractive lens. The diffractive lens is composed of a flat binary Fresnel zone structure and a thin liquid crystal layer, producing high efficiency and millisecond switching times while applying a low ac voltage input. The focusing power of the diffra...

Drying of the cornea during surgery, which causes poor visibility of the fundus, is one of the most serious problems when using a noncontact-type wide-angle viewing system. This study used a newly commercialized lens for observing the fundus with a noncontact wide-angle viewing system. The lens used has a very thin meniscus made of polymethyl methacrylate and a large outer diameter. Following t...

Formulas For Intraocular lens Power calculatIon Modern cataract surgery replaces the natural lens of the eye with an intraocular lens (IOL). After surgery, the optical system of the eye will consist of two major refractive elements, the cornea and the newly inserted IOL. This two-lens system is at the basis of IOL power calculation. To facilitate calculations, both the cornea and the IOL are co...

Drying of the cornea during surgery, which causes poor visibility of the fundus, is one of the more serious problems when using a noncontact type wide-angle viewing system. We developed an antidrying corneal contact lens for use with this type of viewing system. The lens has a very thin meniscus made of polymethyl methacrylate with a large outer diameter. Following application of the viscoelast...

With a conventional lens sharpness of the image is always limited by the wavelength of light. An unconventional alternative to a lens, a slab of negative refractive index material, has the power to focus all Fourier components of a 2D image, even those that do not propagate in a radiative manner. Such "superlenses" can be realized in the microwave band with current technology. Our simulations s...

INTRODUCTION True exfoliation of lens capsule is a relatively rare disorder that has a thin, fluttering membrane in the anterior chamber, mainly located in the pupil area, which is believed to have split from the anterior lens capsule. CASE REPORT The authors present here a patient with true exfoliation and primary angle closure glaucoma in both eyes, the ultrastructure of one eye revealed th...