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Chelation

Chelation is a form of contact lens care which is used to remove inorganic deposits, particularly calcium and magnesium salts. The desired effect is…

Chlamydiae

Chlamydiae are intracellular parasitic bacteria of the family Chlamydiaceae. They are widespread, especially in developing countries, due to poor hygiene conditions. Besides direct contact the…

Ciliary body

The ciliary body is a part of the eye that includes the ciliary muscle, which controls the shape of the lens, and the ciliary epithelium, which produces the aqueous humor. The ciliary body is part…

Coloboma of the iris

Coloboma of the iris is a congenital defect of the uvea. The iris has an irregular shape, such as that of a keyhole or a teardrop. If only the iris is affected, then vision is not affected. If the…

Conjunction

Convex lens (clutch) is used for correction of farsightedness. It changes the parallel beam to the convergent beam…

Conjunctiva

The conjunctiva is a thin, transparent mucous membrane that covers the white part of the visible eyeball. It is very important when comes to…

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…

Contact lenses

A contact lens is an optical lens, located directly on the cornea of the eye. It is a corrective tool to modify and eliminate refractive defects of sight. Its function can be protective…

Contactology

This is a branch of science that deals with the application of contact lenses. It is a combination of the studies of optics, geometry, biology, physiology, ophthalmology and psychology. No photo-…

Contraindication

Cases where wearing contact lenses may become dangerous. Contact lenses should not be used during acute inflammation of cornea, conjunctiva, sclera, and eyelids edges. Other contraindications are…

Cornea

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…

Corneal dystrophy

This is an inherited disease of the cornea. Cause of dystrophy is decreased adhesion of the corneal epithelium to the base membrane. The…

Corneal edema

There are many reasons for corneal edema, leading to various ocular diseases. The use of contact lenses can lead to a hypoxia. As a…

Corneal endothelium

Corneal endothelium forms on the inner surface of the cornea. These cells play an important role in maintaining a stable hydration and the "transparency of the cornea ":/glossary/tran­sparency…

Corneal erosion

It is a disease often linked to the trauma (irritation) of the cornea – caused for example by plants, needles, nails, damaged contact lens, deposits, etc…

Corneal permeability

Corneal permeability is very important in the application of eye medication, because it affects its concentration. Acidic substances and non-dissociated substances penetrate through…

Corneal ulcer

Corneal ulcer, or ulcerative keratitis, is an inflammatory or more seriously, infective condition of the cornea involving disruption of its epithelial layer with involvement of the corneal stroma…

Correction

Removal or mitigation of a defect or disorder. Correction is a term used in the context of the treatment process – e.g. the correction of refractive defects with the use of glasses,

Cosmetic contact lenses

These contact lenses are used to either highlight or change the colour of the iris of a healthy eye. Those that aim to achieve dramatic expression or major change of image are sometimes called…

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…

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According to the law on sales registration, the seller is obliged to issue and provide receipts for all clients. It is also obligatory for the seller to register the sale with the tax administrator with no delay, within 48 hours in case of technical failure.