The Universal Lens - Goldmann's Three Mirror Contact Lens
For examination of the entire ocular fundus and the iridocorneal angle. The advantage of a longer mirror is that it often permits binocular observation of the lateral sections of the ocular fundus.
Zone 1 = Lens examination of the ocular fundus in the 30° zone, mostly with a magnification of 10 x
Zone 2 = Mirror with a declination of 73° Observation of the zone outside of the 30° range
Zone 3 = Mirror with a declination of 66° Observation of the peripheral sections of the ocular fundus, and under favourable conditions, also of the ora serrata
Zone 4 = Mirror with a declination of 59° Observation of the vitreous body and ocular fundus sections neighbouring the ora serrata as well as a gonioscopic examination