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Lacrimation

Tearing, lacrimation, or lachrymation, is the secretion of tears, which often serves to clean and lubricate the eyes in response to an irritation of the eyes. Tears formed through crying are…

Laser technologies: how to obtain good vision without glasses or contact lenses

Today, good vision without visual aids can be possible thanks to…

LASIK: What you should know about the vision correction surgery

Those who suffer from visual impairment normally make use of spectacles or contact lenses in order to correct their vision. However, there’s an increasing…

Light permeability

The transmittance of light to the contact lens should be independent from the central thickness of at least 85%. This means that the loss of absorption and reflection of the material itself…

Limbus

Limbus is the border of the eye, where the cornea converts into an opaque, solid sclera which forms and enlarges to partially cover the outside of the eyeball. In the area of the limbus, there is…

Lipids

Lipids are natural substances forming in animals and vegetables. They exist in liquid or solid form. Although lipids are functionally and chemically mutually different substances, their common…

Lubrication of contact lenses

The need for lubrication (moisturising) of contact lenses is variable. Depending on the chemical composition of the contact lens material, its thickness, composition and the amount of tear film of…

Lysozyme

Tears in their composition contain enzyme lysozyme, which has bactericidal effects (i.e. it kills bacteria). This reduces the risk of infection in the eye…