Search results
Results From The WOW.Com Content Network
Ophthalmic viscosurgical devices (OVDs) are a class of clear gel-like material used in eye surgery to maintain the volume and shape of the anterior chamber of the eye, and protect the intraocular tissues during the procedure. They were originally called viscoelastic substances, or just viscoelastics.
An OVD is a viscoelastic solution, a gel-like substance used to maintain the shape of the eye at reduced pressure as well as to protect the inside structure and tissues of the eye without interfering with the operation. [1] In 1980, D.M. Colvard made the cataract incision in the sclera, which limited induced astigmatism. [9]
Unlike purely elastic substances, a viscoelastic substance has an elastic component and a viscous component. The viscosity of a viscoelastic substance gives the substance a strain rate dependence on time. Purely elastic materials do not dissipate energy (heat) when a load is applied, then removed.
It forms a viscoelastic solution in water. Mechanical protection for tissues (iris, retina) and cell layers (corneal, endothelium, and epithelium) are provided by the high viscosity of the solution. Elasticity of the solution assists in absorbing mechanical stress and providing a protective buffer for tissues. In facilitating wound healing, it ...
Alternatively, the nucleus may be guided out of the eye through the tunnel with the help of a Sheet's glide, [Note 6] and pushed out by internal pressure induced by adding saline from the anterior chamber maintainer or injecting viscoelastic into the chamber. [15] The nucleus may be broken into a few pieces to aid removal, or removed in one ...
Hypromellose (), short for hydroxypropyl methylcellulose (HPMC), is a semisynthetic, inert, viscoelastic polymer used in eye drops, as well as an excipient and controlled-delivery component in oral medicaments, found in a variety of commercial products.
Ivey was in the midst of his best professional season, averaging nearly 18 points per game, 4 rebounds and 4 assists. He's also shooting a career-high 46% from the field and 40% on 3s.
Glaucoma is a group of diseases affecting the optic nerve that results in vision loss and is frequently characterized by raised intraocular pressure (IOP). There are many glaucoma surgeries, and variations or combinations of those surgeries, that facilitate the escape of excess aqueous humor from the eye to lower intraocular pressure, and a few that lower IOP by decreasing the production of ...