The IOLMaster (partial coherence interferometry) measures all of the following parameters for biometry EXCEPT:
- A Axial length
- B Lens thickness ✓
- C Corneal curvature (keratometry)
- D Anterior chamber depth
Correct answer: B. Lens thickness
Explanation
The IOLMaster measures axial length, anterior chamber depth, and corneal curvature. It does not directly measure lens thickness as a standard biometry parameter for IOL calculation. Lens thickness is measured on A-scan or swept-source OCT devices but is not a routine IOLMaster output for standard power formulas.
Reference: AAO BCSC Section 3: Clinical Optics, 2023-2024 ed.
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