Sun, Skin and Health by Slevin Terry;

Author:Slevin, Terry;
Language: eng
Format: epub
Publisher: CSIRO Publishing

Peripheral light focusing and the development of pterygium

During the 1980s, we noticed that light incident from the side was focused by the front of the eye to areas at the limbus and in the lens of the eye on the other side (closest to the nose).

Thus the optics of the eye work ‘side-on’ as well as ‘front-on’. In the front-on mode, light is focused onto the retina (just as a camera lens focuses light onto a chip or film in a camera). We realised that these foci (10–20 times more intense than normal incident light) coincided with the usual sites of pterygium (Fig. 7.3) and a particular type of cataract. A cataract is an opacity of the lens of the eye; a healthy lens is normally transparent (Fig. 7.4).

Both these conditions affect only a sector of the eye on the side closest to the nose. Until this discovery, there had not been a plausible explanation for this location. In both cases, there is focal damage to the stem cells that renew these areas of tissue. These focusing effects were termed the ‘Coroneo effect’ by Fred Hollows.

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