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Center thickness

Related to the term – contact lens transmissibility (Dk/t) The Dk value determines the properties of a contact lens material. A contactologist has to take the thickness of the lens…

Conjunctival hyperemia

This is a conjunctival vasodilatation of the vessel. It is caused by the release of histamine, often due to irritation of the conjunctiva. Vasodilation then causes swelling of conjunctiva…


The cornea is the transparent front part of the eye that covers the iris, pupil, and anterior chamber. The cornea, with the anterior chamber and lens, refracts light, with the cornea accounting…

Corneal contact lenses

These are contact lenses with diameter of 8.5 to 9.5 mm. They are produced as hard contact lenses, either from PMMA, or a copolymer of methyl methacrylate…

Curvature of contact lenses

After the optical power, this is the second most important factor for the selection of contact lenses. On the package you will find under the brand BC with given…