Gonioscopy describes the use of a goniolens (also known as a gonioscope) in conjunction with a slit lamp or operating microscope to gain a view of the iridocorneal angle, or the anatomical angle formed between the eye's cornea and iris. The importance of this process is in diagnosing and monitoring various eye conditions associated with glaucoma
Goldmann indirect goniolens: this truncated-cone like device
utilises mirrors to reflect the light from the iridocorneal angle into
the direction of the observer (as shown by the schematic diagram). In
practice the image comes out roughly orthogonal to the back surface
(nearer the practitioner), making observation and magnification with a slit lamp
easy and reliable. The small, curved front surface does not rest on the
cornea, but instead vaults over it, with lubricating fluid filling the
gap. The border of the front surface rests on the sclera.
While the view obtained is smaller than that of the Koeppe goniolens,
it can be used with the patient sitting upright, and other mirrors
within the device can be used to obtain views of other parts of the eye,
such as the retina and the ora serrata.
Source: Wikipedia
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