How many regions are in the ETDRS grid?

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Study for the Optical Coherence Tomography C Fundamentals Test. Access multiple choice questions and flashcards with hints and explanations. Get exam-ready in no time!

Multiple Choice

How many regions are in the ETDRS grid?

Explanation:
The ETDRS grid splits the macula into nine distinct regions. It has a central subfield around the fovea, plus an inner ring divided into four quadrants (superior, inferior, nasal, temporal) and an outer ring also divided into four quadrants. Counting them gives 1 central region + 4 inner quadrants + 4 outer quadrants = 9 regions in total. This layout lets clinicians assess macular thickness regionally in a standardized way across patients and devices. The other numbers don’t match the standard nine-region layout.

The ETDRS grid splits the macula into nine distinct regions. It has a central subfield around the fovea, plus an inner ring divided into four quadrants (superior, inferior, nasal, temporal) and an outer ring also divided into four quadrants. Counting them gives 1 central region + 4 inner quadrants + 4 outer quadrants = 9 regions in total. This layout lets clinicians assess macular thickness regionally in a standardized way across patients and devices. The other numbers don’t match the standard nine-region layout.

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