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Related Concept Videos

Methods of Obtaining Topography01:25

Methods of Obtaining Topography

Topography involves measuring and mapping land elevations, natural features, and artificial structures to create accurate representations of the terrain. Topographic surveying relies on traditional and modern methods, each with distinct advantages and limitations.Traditional Surveying Methods:Transit stadia surveys and plane table surveys were widely used traditional surveying methods. These techniques relied on instruments like theodolites and stadia rods for measuring distances and angles,...
Topographic Surveying and Contours01:29

Topographic Surveying and Contours

Topographic surveying is critical for documenting the Earth's surface, focusing on capturing elevations, slopes, and natural and man-made features. It is essential in construction planning, water resource management, and land-use analysis. The primary outcome of such surveys is a topographic map, which uses contour lines to visually represent the shape and slope of the terrain, providing valuable insights into the landscape's characteristics.Contour lines are fundamental to understanding the...

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Related Experiment Video

Updated: Jul 14, 2026

Full-Field Optical Coherence Microscopy for Histology-Like Analysis of Stromal Features in Corneal Grafts
07:51

Full-Field Optical Coherence Microscopy for Histology-Like Analysis of Stromal Features in Corneal Grafts

Published on: October 21, 2022

Measuring the cornea: the latest developments in corneal topography.

Tracy Swartz1, Lisa Marten, Ming Wang

  • 1drswartz@wangvisioninstitute.com

Current Opinion in Ophthalmology
|June 15, 2007
PubMed
Summary

New corneal measurement technologies like Scheimpflug imaging and OCT offer enhanced precision for corneal structure analysis. These advanced tomographers improve diagnostic capabilities for various eye conditions.

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Published on: January 3, 2011

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Last Updated: Jul 14, 2026

Full-Field Optical Coherence Microscopy for Histology-Like Analysis of Stromal Features in Corneal Grafts
07:51

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Published on: October 21, 2022

Corneal Confocal Microscopy: A Novel Non-invasive Technique to Quantify Small Fibre Pathology in Peripheral Neuropathies
11:29

Corneal Confocal Microscopy: A Novel Non-invasive Technique to Quantify Small Fibre Pathology in Peripheral Neuropathies

Published on: January 3, 2011

Area of Science:

  • Ophthalmology and Optometry
  • Biomedical Imaging and Instrumentation

Background:

  • Corneal topography and tomography are essential for diagnosing and managing corneal diseases.
  • Traditional methods have limitations in accurately assessing the complex 3D structure of the cornea.

Purpose of the Study:

  • To review advancements in corneal measurement technologies.
  • To evaluate the capabilities and precision of new topographers and tomographers.

Main Methods:

  • Review of current technologies including Placido-disc, slit scanning, Scheimpflug imaging, very high frequency ultrasound, and optical coherence tomography (OCT).
  • Analysis of normative data, repeatability, and diagnostic performance in various populations and conditions.
  • Comparison of different imaging modalities for corneal thickness, elevation, and surface changes.

Main Results:

  • Orbscan provided normative data for Asian populations and repeatability information.
  • Pentacam pachymetry data revealed pattern differences useful as keratoconus indices.
  • Scheimpflug imaging and OCT demonstrated improved precision in measuring corneal structure, including posterior surface changes and epithelial thickness.

Conclusions:

  • Advanced corneal topographers, including Scheimpflug imaging, ultrasound, and OCT, significantly enhance measurement capabilities and precision.
  • These technologies offer improved diagnostic accuracy and potential for better surgical planning in ophthalmology.