Corneal tomography using Scheimpflug imaging provides a significant advantage over Placido disc-based topography by directly measuring which of the following?
- A Posterior corneal elevation and pachymetry ✓
- B Tear film stability
- C Anterior corneal curvature
- D Corneal epithelial thickness
Correct answer: A. Posterior corneal elevation and pachymetry
Explanation
Scheimpflug imaging captures cross-sectional images of the cornea, allowing direct measurement of posterior corneal elevation and full pachymetry. Placido disc systems only measure anterior curvature and must mathematically estimate the posterior surface. Posterior elevation is critical for detecting ectasia and screening refractive surgery candidates.
Reference: AAO BCSC Section 3: Clinical Optics, 2022-2023 ed.
High-yield for: NEET PGINI-CETNExTFMGEUSMLEPLABMRCP
Written and medically reviewed by the StethoPrep medical team.