Although urates are not found within the eye, there is in other morbid ocular conditions quite frequently a deposition of foreign matter, such as alien crystals, of varied description. For instance:—
In the sclera on rare occasions we find osteomatous degeneration.
In the choroid there may be true bone which forms a cup so extensive that it can be felt by the finger, or, again, there may be calcareous plaques.
The retina may undergo colloidal changes or be the site of carbonate of lime or of cholesterin.
The vitreous may sparkle with showers of cholesterin.
The lens may contain both tyrosine and cholesterin.
The aqueous shows similar crystals.
In the iris degenerative calcareous or osseous deposits are occasionally seen.
The cornea may be affected by hyaline degeneration with deposition of lime salts.
The conjunctiva may be calcareous.