Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 5 of 5 for “"Keratometry"”.
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Analysis and Correction of Corneal Astigmatism in Modern Pseudophakia
… magnitude and axis of astigmatism measured by keratometry and manifest refraction in a pseudophakic population was investigated. The axis measurements in particular showed very poor agreement; far outside an acceptable level of misalignment, significantly decreasing the effective correction …
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Posterior Corneal Astigmatism
… measurement of total corneal astigmatism, “total keratometry” (TK) is as accurate as Goggin nomogram adjusted keratometry (GNAK) values.
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Measuring Corneal Topography Using Wavefront Analysis Technique
… for measuring corneal topography include keratometry, videokeratoscopy, and scanning slit imaging. A new type of instrument, a corneal topographer based on a Hartmann-Shack wavefront sensor for measuring corneal elevation over a spherical surface, is presented in this thesis. The performed …
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Outcomes of corneal crosslinking for the treatment of keratoconus at a tertiary South African hospital
… on corneal tomography and its clinical signs. Keratometry values and visual acuities were measured to ascertain if there was improvement in acuity or corneal curvature at 6 months post-procedure. Results. Nineteen eyes of 17 patients were included. The group consisted of 6 (32%) males and 13 …
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Applications of ray tracing to a pseudophakic eye model
The calculation of IOL power using keratometry is adversely affected by recent corneal reshaping surgeries. This thesis investigates the application of ray tracing and general anterior corneal surface modeling, for the purpose of improving ophthalmic measurements and in particular, the estimation …