Question

In the grading of Trachoma, Trachomatous Inflammation-Follicular (TF) is defined as the presence of:

• A. Five or more follicles in the lower tarsal conjunctiva
• B. Three or more follicles in the lower tarsal conjunctiva
• C. Five or more follicles in the upper tarsal conjunctiva
• D. Three or more follicles in the upper tarsal conjunctiva

Hint:

TF grading needs 5+ follicles specifically in the upper tarsal conjunctiva.

Answer 1

The Correct Option is C

Step 1: Understanding the Question:
The question asks for the exact sign used to diagnose the follicular stage of trachoma under the WHO simplified grading system.

Step 2: Key Formula or Approach:
The WHO simplified grading system for trachoma has five signs, remembered by the letters FISTO: TF (trachomatous inflammation, follicular), TI (trachomatous inflammation, intense), TS (trachomatous scarring), TT (trachomatous trichiasis), and CO (corneal opacity). Each sign is checked by everting the eyelid and examining a specific conjunctival surface.

Step 3: Detailed Explanation:
TF, trachomatous inflammation follicular, is defined as the presence of five or more follicles, each at least 0.5 mm across, in the upper tarsal conjunctiva, which is the conjunctiva lining the inner surface of the upper eyelid.
The lower tarsal conjunctiva is not the surface used for this sign, so options naming the lower lid are incorrect.
A count of three or more follicles is not the WHO cut off, five or more is the correct number.

Step 4: Final Answer:
TF is defined as five or more follicles in the upper tarsal conjunctiva. This is option (C).