The ophthalmologist should evaluate the following variables in/of the AC:
• Transparency (clarity)
• Presence of foreign material1
• Angle recession
• Abnormal tissue configuration (i.e., synechia)
The normal depth of the AC is 3 mm ; a significantly shallower or deeper AC is easily recognized by the reduced or increased distance between the cornea and the iris.
1 e.g., IOFBs (see Chap. 2.13), fibrin, lens particles; see below
It is often easier to judge AC depth with the naked eye (rather than at the slit lamp) because this permits instant comparison with the normal fellow eye.
The AC depth may be uniformly or only partially abnormal. Lens dislocation is the most common cause, although other etiologies also occur.
Reduced clarity of the aqueous, presence of foreign material, or abnormal tissue configuration are also often recognizable with a penlight; nevertheless, the slit lamp remains the most effective diagnostic tool. The presence of white blood cells and flare are signs of anterior uveitis. Recognition of an angle recession requires a contact lens, although the UBM is an excellent alternative .
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