What is sulcus in the eye?
The ciliary sulcus, as the name implies, is a small space between the posterior surface of the iris base and the anterior surface of the ciliary body. The diameter of the sulcus depends on the eye, but it is typically about 12 mm wide.
Where does a sulcus lens go?
It should be in front of the anterior capsular bag.” Place the haptics where the lens will get the most support. “If you have an area where there’s weakness, such as a defect in the posterior capsule and/or weak zonules, you don’t want to put the sulcus lens haptics where the weakness is,” says Dr. Devgan.
What is a 3 piece lens for cataract?
Single-piece IOLs have soft and broader haptics which are made of the same material as the optic, usually hydrophobic or hydrophilic acrylic, whereas 3-piece IOLs have rigid haptics which are made of poly methyl methacrylate (PMMA).
How close can you see with monofocal lenses?
Monofocal IOLs Monofocal lenses offer vision at one distance only (far, intermediate or near). Talk to your doctor about whether it’s most important for you to see up close or at a distance without glasses. If you choose the distance option, you will still likely need glasses for reading and computer work.
What is ciliary epithelium?
The ciliary epithelium of the ciliary processes produces aqueous humor, which is responsible for providing oxygen, nutrients, and metabolic waste removal to the lens and the cornea, which do not have their own blood supply.
What are Zonules in the eye?
Ciliary zonules are a ring of fibrous structures anchoring the ciliary body with the lens of the eye. These are the structures that help to maintain the position of the lens in the optical path, and anchor muscles that change the shape of the lens to alter focus.
How is Sfiol power calculated?
A simple rule of thumb is that 0.50 diopters (D) is subtracted from the calculated capsular bag power from +28.00 D to +17.50 D and 1.00 D subtracted from the capsular bag power from +28.50 D to +34.00 D. For IOL powers of +17.00 D and below, most commonly there is no change to the IOL power required.
What are PMMA lens?
Conventional hard contact lenses are made of a fairly stiff plastic (polymethyl methacrylate, or PMMA), which does not mold to the shape of the eye. They are inexpensive and durable, but they are the least comfortable type of contact lens.
What is single piece lens?
Intraocular lenses (IOLs) are used in ophthalmic surgery to replace the lens of the eye and rectify refractive errors. Single-piece IOLs (also referred to as one-piece) are named as such due to both elements being composed of the same material ( acrylic, silicone or PMMA).
What is IQ lens?
The AcrySof IQ IOL (Alcon) is designed to provide a youthful lens to patients with cataracts. With its advanced biocompatible material and innovative design, it is designed to mimic the young adult lens by not only reducing spherical aberrations, but also filtering blue light.
Is monofocal the same as monovision?
One implant technique, known as IOL monovision (or pseudophakic monovision), may help reduce your dependence on glasses following cataract surgery. Monovision corrects your vision by using a different monofocal replacement lens – i.e., each lens is set to a different distance – in each eye.
Is monofocal lens good?
Generally, monofocal lenses correct distance vision, but we can have them made to correct a particular visual distance you desire. If you don’t mind still relying on glasses for specific tasks – such as reading – then monofocal lenses are suitable for your needs.
Why do I need a sulcus in my eye?
Generally, sulcus placement happens in eyes that have a posterior capsule defect, which is the most common reason, or because the eye has loose zonules.” Use of sulcus placement in the latter situation, however, is subject to some debate.
What is an upper eyelid superior sulcus?
What is an upper eyelid superior sulcus? Unwanted hollows or recesses of the upper eyelid, below the bony orbital rim. A sunken appearance in this area is termed a “sulcus deformity” and can lend an overly aged or skeletonized appearance.
What is the medical dictionary definition of sulcus?
A deep, narrow furrow or groove, as in an organ or tissue. Any of the narrow fissures separating adjacent convolutions of the brain. The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
How big is the IOL in the sulcus?
“What you want is a haptic length of about 14 mm or more. The longest haptic length we have in the U.S. is 13 mm. If you simply place an IOL with a 13-mm haptic length in the sulcus of a large eye without capturing the optic, it can decenter and tilt.