topography

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Related to Corneal topography: keratoconus

topography

(təpŏg`rəfē), description or representation of the features and configuration of land surfaces. Topographic maps use symbols and coloring, with particular attention given to the shape and elevations of terrain. Relief is portrayed by means of contourcontour
or contour line,
line on a topographic map connecting points of equal elevation above or below mean sea level. It is thus a kind of isopleth, or line of equal quantity.
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 lines, hachures, shading, or coloring to represent elevations, depressions, and depths of water; natural and human-made features, such as rivers, forests, urbanized areas, bridges, roads, and power lines, are indicated by symbols and color overlays. Topography is often used incorrectly as a synonym for relief; the submarine analogue is bathymetry.

Topography

Physical features of a particular location, including the shape of the surface of the ground.

topography

[tə′päg·rə·fē]
(geography)
The general configuration of a surface, including its relief; may be a land or water-bottom surface.
The natural surface features of a region, treated collectively as to form.

topography

1. the study or detailed description of the surface features of a region
2. the detailed mapping of the configuration of a region
3. the land forms or surface configuration of a region
References in periodicals archive ?
Assort is currently negotiating with makers of refractive lasers and corneal topography machines to include Alpins' method in the programming of their equipment.
Tan, "Evaluation of Orbscan II corneal topography in individuals with myopia," Ophthalmology, vol.
Effect of pterygium surgery on corneal topography. Ophthalsurg lasers 2001;32:35-40.
Based in Houston, Texas, Tracey Technologies has produced devices integrating ray tracing aberrometry wavefront analysis with advanced corneal topography analysis for a decade, with the iTrace series of products offered since 2008.
Other chapters address corneal topography and tomography; the application and validation of the registration approach; optical coherence tomography (OCT) and clinical and research applications, uses in medical or surgical treatment, and uses in the detection and monitoring of cysts; the evolution of fundus perimetry technology; applications of IVCM (in vivo confocal microscopy) in clinical settings and research; the biomechanical modeling of blood vessels; hybrid finite element simulation for bioheat transfer; the effects of electromagnetic fields on specific absorption rate and heat transfer; dry eye characterization by analyzing tear film images; and thermography.
Corneal topography in clinical practice (Pentacam system); basics and clinical interpretation, 2d ed.
Corneal topography in the wavefront era; a guide for clinical application.
Corneal topography provides an invaluable platform for the observation of corneal profile and ultimate choice of contact lens design.
The prevalence of true unilateral keratoconus has been reported to range from 0.5-4% in studies using computerized videokeratography (1,2) and was 4.5% in a more recent study using slit scanning corneal topography (Orbscan 2).
This type of analysis is more comprehensive than the simple analysis of the corneal topography as it offers the refractive behavior of a chosen area of the anterior corneal surface in a global form rather than the focal one obtained when the study is performed by the analysis of the keratometry values in given meridians.
Another study by Sonmez et al20 showed that hyperglycemia causes refractive change in cornea of diabetic patients and was detected by corneal topography. Lee et al21 showed that patients who had diabetes for more than or equal to 10 years duration had advanced corneal morphological abnormalities.