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Tear duct

The tear duct is the eye’s drainage system for tears. The valve serves to open or close the duct, allowing passage of tears.

Tear film

Tears produce corneal tear film, which generally has a thickness from 0.005 to 0.012 mm and is renewed every 10 to 30 seconds. Its function is to keep the cornea smooth and shiny, protecting…

Tear secretion

Tear secretion is glandular activity, consisting of a secretion of substances that are necessary for the function of the eye. Basal tear secretion – resting constant tear…


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…

Temple Arm Length

The temple arm length is measured from the beginning to the end including the bend at the end of the arm. Most common temple arm length falls between 120 mm and 150 mm. Supposing our…

Therapeutic contact lens

Therapeutic (curative) contact lenses are used to reduce sharp light, moisturizing the cornea when it is damaged, as a bandage after eye surgery, as a drug carrier, allergies to the patch, in the…

Tinted contact lenses

Light blue tint contact lens materials is due to a better recognition of the contact lens in the solution. Completely clear contact lens is hardly visible.

Tolerance to contact lenses

Ideally tolerant material for contact lenses should not interfere: Physiology of the eye Circulation of…

Toric contact lenses

Toric contact lenses are used to correct astigmatism. Certain patients have what is known as corneal astigmatism. What that means is, instead of the cornea…

Toxic reaction

In contact with a contact lens, some pharmacological agents or preservatives accumulate and cause a toxic reaction (for example the formation of the


This is a blood glycoprotein whose function is to generate the emergency supply of blood and to transport it to the mechanism of endocytosis into cells. It is situated in the liquid…


Transmissibility means the oxygen permeability of a particular contact lenses. Indicates the material's ability to transmit gas to the central membrane thickness. This quantity is called…

Transparency of the cornea

This is the transparency of the cornea. Normal visual acuity is determined by the transparency of optical media. The endothelium of…


This is generally a mechanical irritation of eye tissues (cornea, conjunctiva, eyelid), which may result in a inflammation of the eye…


Trichiasis is a condition where the initially correct eyelashes turn against the eyeball. It irritates the cornea and conjunctiva – see trauma. The most…

Тhermal decontamination

This is the safest way to clean contact lenses – from the emergence of possible allergic reactions to care for contact lenses. It is an outdated…

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