Corneal Topography Map Explainer
Demystify your Pentacam, Orbscan & Galilei maps - understand colors, diopters, pachymetry & elevation.
Axial Curvature Map
Diopters (D)Tap or hover anywhere across the corneal surface to probe local curvature, thickness, and anatomy.
Live Point Probe Inspector
Clinical Interpretation:
This zone shows pronounced inferior steepening typical of Keratoconus. The cornea has weakened and bulged forward under intraocular pressure, creating irregular astigmatism and vertical coma ghosting. Glasses cannot fully correct this distortion because the optical surface is asymmetric.
Scan Value Decoder & Stage Classifier
Enter the key numbers from your doctor's topography printout to decode your staging and cross-linking eligibility:
Moderate steepening with significant irregular astigmatism. Rigid Gas Permeable (RGP) or scleral lenses typically required for crisp 20/20 visual acuity.
Clinical Topography Cheat-Sheet
The flattest and steepest meridians of the central cornea. Normal is 42.0 to 44.5 D. A high difference indicates significant corneal astigmatism.
The absolute highest dioptric curvature anywhere on the cornea. In KC, Kmax is usually located in the inferior or inferotemporal quadrant.
The thinnest point of the cornea in microns (µm). Normal corneas average ~540 µm. Values under 480 µm raise ectasia suspicion; under 400 µm requires specialized CXL.
The back surface curvature of the cornea relative to a Best Fit Sphere. The back of the cornea often bulges forward before the front surface shows disease!
Can You Read a Scan?
Test your newfound knowledge of corneal scans: