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Material flexibility

The flexibility of contact lens material plays an important role when handling contact lenses, for the length of usage and for correct fitting the eye. It is important to maintain a balanced…

Melanin

This is brown pigment in the skin, hair and iris of the eye. The colour of the iris is caused by different amount of melanin. The green and blue eyes lack this pigment. After birth, melanin is…

Metabolism of cornea

Corneal metabolism is dependent on the supply of glucose and water. The main source is the tear film. The usage of contact lenses can lead to hypoxic conditions – see

Microcysts

These are clusters of dead epithelial cells, resulting from hypoxia. Microcysts are mostly found in long worn contact lenses. After…

Mirrored

A mirrored layer is a reflective coating applied to the outside of the lenses. It helps to decrease sharp light by reflecting it. It also causes things to appear darker than they really are. They…

Monovision

Monovision is a method of vision correction when a spherical contact lens for distance vision is applied on one eye while the other eye has a…

Mucin

Mucin is phlegm (mucus). Its secretion happens in the epithelium of the conjunctiva and is an important component of the tear film. Mucin adheres to the hydrophobic surface of the cornea and…