4. Trachomatous trichiasis (TT) and corneal opacity (CO)
Introduction
Cicatricial disease is the term used to encompass the scarring and eventual distortion of the architecture of the lid that occurs as a result of active, inflammatory trachoma.
Trachomatous Trichiasis (TT)
Definition
The presence of one or more lashes of the upper lid that touch the globe, lashes do not need to contact the cornea. Evidence of removal of in turned eyelashes.
The diagnosis should be made by examining the lashes in the resting state. Moving the eyelid to determine if lashes do in fact touch the globe is an important aid to diagnosis.
If there is evidence of recent epilation, then the eye should be diagnosed as having TT.
Figure 13: Trachomatous trichiasis (TT).
At least one eyelash that rubs on the globe or evidence of recent removal of in-turned eyelashes.
Corneal opacity (CO)
Definition
Easily visible corneal opacity over the pupil.
Finally, the cornea must be examined for the presence of opacities. An opacity that is significant enough to obscure part of the pupillary margin should be classified as CO.
It is important to be confident distinguishing corneal opacities from cataracts. Cataract is an opacification of the lens. The lens lies behind the iris and so will not cause blurring or obstruction of the pupil margin.
Figure 14: Corneal opacity.
Easily visible corneal opacity over the pupil.