This is in many ways similar to acute glaucoma, but there are more vague symptoms. The angles, where the aqueous humor
drains, closes intermittently. This is sometimes accompanied by pain or discomfort, or headaches. There are even times
when there are no noticeable symptoms, but the vision can slowly deteriorate just the same. Even on examination, the eyes
can appear relatively normal, and the vague symptoms cannot be explained. It is particularly difficult to diagnose. When
treated with laser, the patient is protected from having an acute glaucoma attack, and the vague symptoms disappear.
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