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Central corneal thickness measurement in clinical practice
Yevgeniy Shildkrot1, Jeffrey M Liebmann, Bartosz Fabijanczyk
1Department of Ophthalmology, New York University School of Medicine, New York, NY 10022, USA.
Journal of Glaucoma
|September 9, 2005
Summary
A single central corneal thickness (CCT) measurement may not be adequate for glaucoma risk assessment. Significant CCT variations in 20% of eyes highlight the need for careful measurement and continued investigation into influencing factors.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Corneal Physiology
Background:
- Accurate central corneal thickness (CCT) measurement is crucial for glaucoma risk assessment.
- Variability in CCT can impact intraocular pressure (IOP) readings and glaucoma diagnosis.
Purpose of the Study:
- To evaluate the reliability of a single CCT measurement for glaucoma risk assessment.
- To determine the extent of CCT variability in clinical practice.
Main Methods:
- Ultrasound pachymetry was used to measure CCT in 98 eyes on two separate occasions.
- Eyes with prior surgery or corneal pathology were excluded.
- Measurements were taken at least one month apart.
Main Results:
- No significant difference in mean CCT was found between the two visits.
- However, CCT differed by over 20 micrometers in 20.4% of eyes.
- No correlation was found between CCT differences and IOP, time interval, or glaucoma diagnosis.
Conclusions:
- A single CCT measurement may not be sufficient for reliable glaucoma risk assessment due to potential variability.
- The findings underscore the importance of considering measurement variability and potential influencing factors.
- Further research is needed to understand factors affecting CCT measurement accuracy.