What is Decentration of IOL?
IOL decentration was calculated as the distance between the IOL axis and the IOL center. IOL tilt was defined as the angle between the IOL axis and the visual axis. IOL decentration was obtained from the distance between the IOL center and the pupillary axis.
How can we prevent Decentration of IOL?
To reduce the risk of decentration, we recommend a capsulorrhexis diameter smaller than the optic, visual confirmation of optic–haptic separation, and centration of the optic within the capsular bag at the conclusion of surgery.
What is aspheric UV absorbing IOL?
The AcrySof Aspheric IOL (model SA60WF) is an ultraviolet-absorbing acrylic foldable single-piece IOL. The posterior aspheric surface is designed with negative spherical aberration to compensate for the positive spherical aberration of an average cornea.
What is Chang Waring chord?
A more modern and functional equivalent is the Chang-Waring chord (CWC), also known as chord mu. It is a two-dimensional vector measured across the corneal surface from the center of the pupil to the coaxially sighted, subject-fixated corneal light reflex.
Is aspheric the same as toric?
They are related to toric lenses in the same way that aspheric lenses are related to spherical lenses.
What is CW chord?
(2) CW chord refers specifically to the angle between the subject-fixated coaxially sighted corneal light reflex to the pupil center.
What is CW cord?
CW Cable. CONSTANT WATTAGE (CW) CABLE – 400V, 480°C. Constant Wattage Cable consists of two parallel bus wires encased in a jacket with a wire heating element wrapped around the jacket and soldered to alternating bus wires. The wire and jacket are then encased in an insulating jacket.
What is the purpose of aspheric lens?
In photography, a lens assembly that includes an aspheric element is often called an aspherical lens. The asphere’s more complex surface profile can reduce or eliminate spherical aberration and also reduce other optical aberrations such as astigmatism, compared to a simple lens.
What does an aspheric lens do?
Aspherical lenses, where the curve of the lens element surface is no longer part of a perfect sphere, can be used to correct such focusing aberrations. Aspheric lenses result in sharper images, especially at wider apertures, and can also be designed to minimise other optical imperfections such as chromatic aberrations.