SUMMARY The bleb which develops following trabeculectomy may be diffuse or cystic in nature. Cystic blebs can be complicated by infection, leakage of aqueous, astigmatism and problems related to contact lens wear whereas diffuse blebs are not associated with such problems.
The unique position of the eye as a superficial, easily accessible organ makes it readily available for inspection. However, in certain circumstances, particularly where there is cataract formation, the posterior segment is obscured from view using the ophthalmoscope. In addition to intraocular lesions, most extra-ocular lesions are not accessible for study and assessment by the ophthalmologist. Ultrasound offers a unique opportunity to inspect the lens, the posterior segment, the wall of the...