Scheimpflug imaging (Pentacam) differs from Placido disc-based topography in that it directly measures which of the following?
- A Anterior corneal curvature only
- B Tear film stability
- C Anterior and posterior corneal elevation and pachymetry ✓
- D Corneal endothelial cell density
Correct answer: C. Anterior and posterior corneal elevation and pachymetry
Explanation
Scheimpflug imaging rotates around the eye to capture cross-sectional images, directly measuring anterior and posterior corneal elevation, curvature, and full pachymetry. Placido disc systems only assess anterior corneal surface curvature. Tear film is assessed by tear breakup time or interferometry. Endothelial cell density is measured by specular microscopy.
Reference: Ophthalmology, Yanoff and Duker, 5th ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.