Name
Title | ||
|---|---|---|
Enhancing the Standard Operating Range of a Placido Disk Videokeratoscope for Corneal Surface Estimation |
Abstract | ||
|---|---|---|
Corneal topography estimation that is based on the Placido disk principle relies on good quality of precorneal tear film and sufficiently wide eyelid (palpebral) aperture to avoid reflections from eyelashes. However, in practice, these conditions are not always fulfilled resulting in missing regions, smaller corneal coverage, and subsequently poorer estimates of corneal topography. Our aim was to enhance the standard operating range of a Placido disk videokeratoscope to obtain reliable corneal topography estimates in patients with poor tear film quality, such as encountered in those diagnosed with dry eye, and with narrower palpebral apertures as in the case of Asian subjects. This was achieved by incorporating in the instrument's own topography estimation algorithm an image processing technique that comprises a polar-domain adaptive filter and a morphological closing operator. The experimental results from measurements of test surfaces and real corneas showed that the incorporation of the proposed technique results in better estimates of corneal topography, and, in many cases, to a significant increase in the estimated coverage area making such an enhanced videokeratoscope a better tool for clinicians. |
Year | DOI | Venue |
|---|---|---|
2009 | 10.1109/TBME.2008.2005997 | Biomedical Engineering, IEEE Transactions |
Keywords | Field | DocType |
adaptive filters,bio-optics,biomedical optical imaging,eye,medical image processing,optical tomography,placido disk videokeratoscope,corneal surface estimation,corneal topography estimation,dry eye diagnosis,eyelash reflections,image processing technique,morphological closing operator,palpebral aperture,polar-domain adaptive filter,precorneal tear film,wide eyelid aperture,adaptive filtering,cornea,keratrometry,tear film | Aperture,Eyelid,Placido disk,Computer science,Cornea,Image processing,Corneal topography,Optics,Optometry,Adaptive filter,Palpebral fissure | Journal |
Volume | Issue | ISSN |
56 | 3 | 0018-9294 |
Citations | PageRank | References |
0 | 0.34 | 6 |
Authors | ||
4 | ||
Name | Order | Citations | PageRank |
|---|---|---|---|
| Weaam Alkhaldi | 1 | 0 | 1.35 |
| D. Robert Iskander | 2 | 104 | 23.65 |
| Abdelhak M. Zoubir | 3 | 316 | 47.52 |
| Michael J. Collins | 4 | 163 | 24.59 |