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A zonal corneal elevation map shows how the cornea's surface height changes across different zones. It compares your cornea to a reference shape and highlights areas that sit higher or lower than expected. Eye doctors use it with corneal topography or tomography to study cornea shape. It helps with contact lens fitting and screening for irregular corneas.
read more about zonal corneal elevation map ...Elevation is the cornea's height relative to a reference surface, not the cornea's thickness. Areas shown as higher elevation sit more ?forward? than the reference, while lower elevation sits more ?back.? The device uses color and numbers to display these differences. The meaning of each color depends on the map scale used.
Zonal means the results are looked at by sections, like center versus outer rings. This helps a doctor see if a change is localized or spread across a wider area. It also helps compare patterns between the front surface and back surface of the cornea. Zone-by-zone review matters when the map looks uneven.
Elevation maps can help spot irregular cornea patterns that do not show up on a basic eye chart test. They can also support contact lens planning, especially for rigid or specialty lenses. Doctors also use them when checking for keratoconus or post-surgery cornea changes. They are usually read together with curvature maps and thickness data.
Dry eyes can distort the tear film and make the map look noisy. Blinking right before the scan helps smooth the tear film. Contact lens wear can temporarily change the cornea surface, so you may be asked to stop wearing lenses before testing. If a scan looks odd, repeat scans are common.
No. Curvature maps show how steep or flat the cornea is. Elevation maps show height differences compared with a reference shape.
Yes. An uneven tear film can create false bumps or rough patterns. Treating dryness and repeating the scan can help.
Not always. Some elevation changes are normal, and the map must be read with other tests. A doctor looks for a full pattern, not one spot.
Often, yes, especially for rigid lenses. Contacts can temporarily alter cornea shape. Your clinic will tell you how long to pause based on lens type.
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