Iris Aperture
Iris Aperture - Related Videos
06:56
A System for Culturing Iris Pigment Epithelial Cells to Study Lens Regeneration in Newt
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Cited by 7 •
2011
In newt, the lens regenerates always from the dorsal iris by transdifferentiation of the iris pigmented epithelial cells (IPEs). Here we describe a procedure to culture dorsal and ventral newt IPE cells and their implantation to the newt eye. The implanted cells are then studied by tissue sectioning and immunohistochemistry.
11:04
Biomolecular Detection employing the Interferometric Reflectance Imaging Sensor (IRIS)
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Cited by 2 •
2011
Quantitative, high-throughput, real-time, and label-free biomolecular detection (DNA, protein, etc.) on SiO2 surfaces can be achieved using a simple interferometric technique which relies on LED illumination, minimal optical components, and a camera. The Interferometric Reflectance Imaging Sensor (IRIS) is inexpensive, simple to use, and amenable to microarray formats.
05:22
Iris Fixation via External Pentagram Suturing
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2022
The present protocol describes how a 10-0 polypropylene suture crosses the anterior surface of the iris, forming a pentagram to prevent both iris and pupil from moving toward the cornea. This can be combined with subsequent keratoplasty to cure bullous keratopathy with extensive anterior synechia of the iris.
06:57
Puncture-Induced Iris Neovascularization as a Mouse Model of Rubeosis Iridis
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Cited by 4 •
2018
Iris neovascularization, a common complication of ischemic retinal disease, may lead to sight-threatening neovascular glaucoma. Here, we describe a murine protocol for inducing experimental iris neovascularization that may be used for noninvasive evaluation of angiogenesis-modulating substances.
13:07
Convergent Polishing: A Simple, Rapid, Full Aperture Polishing Process of High Quality Optical Flats & Spheres
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Cited by 11 •
2014
A novel optical polishing process, called “Convergent Polishing”, which enables faster, lower cost polishing, is described. Unlike conventional polishing processes, Convergent Polishing allows a glass workpiece to be polished in a single iteration and with high surface quality to its final surface figure without requiring changes to polishing parameters.
FAQs
Each blade contributes to the same central opening, so coordinated radial motion changes the diameter without requiring a separate optical path. Because the blades overlap, the aperture can remain nearly circular as it opens or closes. That geometry gives an imaging system a compact way to vary transmitted light while maintaining a consistent optical opening.
Changing the opening diameter changes how much illumination reaches the downstream optical system. A wider setting can support greater light transmission, whereas a narrower setting limits illumination and unwanted rays. In camera and imaging arrangements, that adjustment affects exposure and can also change depth of field, so the setting links light control with image formation.
A nearly circular opening helps the system regulate rays around the central axis in a balanced way. This supports predictable image behavior as the blades move and helps engineers manage image quality rather than introducing a strongly asymmetric opening. The feature is therefore useful when an instrument must respond consistently to changing illumination conditions.
The appropriate setting depends on the optical result required from the instrument. Engineers can adjust the opening to regulate illumination, influence exposure, shape depth of field, improve image quality, or limit unwanted rays. Considering these effects together is important because changing one aperture setting can alter several aspects of imaging or measurement at once.
Begin by identifying whether the setup needs more illumination, less exposure, a particular depth of field, or stronger control of unwanted rays. Then change blade position to alter opening diameter and evaluate the resulting image or sensor response. Iterative adjustment lets engineers match the aperture to changing measurement or imaging conditions.
It is useful wherever optical measurements or images must be adapted to changing light conditions. Examples include cameras, microscopes, sensors, precision instruments, machine-vision systems, laser systems, and experimental setups. In these contexts, the adjustable opening helps engineers regulate illumination or unwanted rays while tuning the system for imaging, sensing, or controlled optical experiments.