Telecanthus
Encyclopedia
Telacanthus refers to increased distance between the medial canthi of the eyes, while the inter-pupillary distance is normal. This is in contrast to hypertelorism
Hypertelorism
Hypertelorism is an abnormally increased distance between two organs or bodily parts, usually referring to an increased distance between the orbits . In this condition the distance between the inner eye corners as well as the distance between the pupils is greater than normal...

, where the inter-pupillary distance is increased.

The distance between the inner corner of the left eye and the inner corner of the right eye, is called intercanthal distance. Usually, in most people, the intercanthal distance is equal to the distance between the inner corner and the outer corner of each eye equaling the width of the eye. The situation, where intercanthal distance is intensely bigger than the width of the eye, is called telecanthus (tele= Greek τηλε = far, and Greek ακανθα = thorn). This can be an ethnic index or an indication for hypertelorism or hypotelorism
Hypotelorism
-Causes:It is often a result of fetal alcohol syndrome caused by large alcohol intake in the first month of pregnancy.It can be associated with trisomy 8.It can also be associated with fragile X syndrome....

, if it is combined with abnormal relation to the interpupillary distance (A D STEAS).
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