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A new, pachymetry-based approach for diagnostic cutoffs for normal, suspect and keratoconic cornea
- Source :
- Eye. 26:650-657
- Publication Year :
- 2012
- Publisher :
- Springer Science and Business Media LLC, 2012.
-
Abstract
- To analyze whether an association exists between keratometric and pachymetric changes in the cornea, and whether it can be used to create pachymetric cutoff criteria secondary to keratometric criteria.In this cross-sectional study, 1000 candidates presenting to the refractive surgery services of a tertiary care hospital underwent bilateral Orbscan IIz (Bausch and Lomb) assessment along with other ophthalmic evaluation.Stepwise regression analysis-based models showed that simulated keratometry (simK) astigmatism was significantly predicted by the minimum corneal thickness (MCT) and difference between central and MCT (δCT), mean SimK by the MCT and δCT, and maximum keratometry in the central 10-mm zone by the MCT and δCT (P0.001). The mean MCT values were 542.5 ± 39.6, 539.9 ± 39.2, 524.2 ± 49.5, and 449.3 ± 73.7 μm for flatter normal (44 D), steeper normal (≥ 44 D), keratoconus suspect and keratoconic eyes, respectively (P0.001). The mean differences between central corneal thickness and MCT (δCT) were 12.2 ± 7.1 μm, 12.4 ± 7.4 μm, 14.4 ± 8.9 μm and 23.2 ± 10.1 μm for the flatter normal, steeper normal, keratoconus suspect, and keratoconic eyes, respectively (P0.001). Mean and 2SD cutoff were used to suggest that a cornea having MCT461 μm or δCT27 μm has only a 2.5% chance of being normal and not a keratoconus suspect or worse.Pachymetric diagnostic cutoffs can be used as adjuncts to the existing topographic criteria to screen keratoconus suspect and keratoconic eyes.
- Subjects :
- Male
Keratoconus
medicine.medical_treatment
Stepwise regression analysis
Astigmatism
law.invention
Cornea
Young Adult
law
Refractive surgery
medicine
Humans
medicine.diagnostic_test
Keratometer
business.industry
Corneal Topography
Tertiary care hospital
medicine.disease
Corneal topography
Ophthalmology
Cross-Sectional Studies
medicine.anatomical_structure
Clinical Study
Optometry
Female
sense organs
business
Subjects
Details
- ISSN :
- 14765454 and 0950222X
- Volume :
- 26
- Database :
- OpenAIRE
- Journal :
- Eye
- Accession number :
- edsair.doi.dedup.....affb43072140d6f6798b4f6ea9207587