Ophthalmic viscosurgical device
Ophthalmic Viscosurgical Device (OVD)
Ophthalmic Viscosurgical Device (pronunciation: op-thal-mic vis-co-sur-gi-cal de-vice) is a medical tool used in eye surgery to maintain the depth and shape of the anterior chamber, protect the corneal endothelium, and facilitate intraocular manipulations.
Etymology
The term is derived from the Greek words ophthalmos meaning "eye", viscosus meaning "sticky", surgical meaning "pertaining to surgery", and device meaning "tool or instrument".
Types of Ophthalmic Viscosurgical Devices
There are three main types of OVDs:
- Cohesive OVDs: These have high molecular weight and high viscosity. They are used to maintain space and protect intraocular tissues during surgery. Examples include Healon, Provisc, and Amvisc Plus.
- Dispersive OVDs: These have low molecular weight and low viscosity. They are used to protect the corneal endothelium during phacoemulsification. Examples include Viscoat and Ocucoat.
- Viscoadaptive OVDs: These have both high and low molecular weight components. They can act as both cohesive and dispersive OVDs. An example is Healon 5.
Usage
Ophthalmic Viscosurgical Devices are used in various types of eye surgeries such as cataract surgery, glaucoma surgery, corneal transplant, and retinal detachment surgery. They help in maintaining the shape of the anterior chamber, protecting the corneal endothelium, and facilitating intraocular manipulations.
Related Terms
External links
- Medical encyclopedia article on Ophthalmic viscosurgical device
- Wikipedia's article - Ophthalmic viscosurgical device
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