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Translaminar Autonomous System Model for the Modulation of Intraocular and Intracranial Pressure in Human Donor Posterior Segments
Published on: April 24, 2020
Adjusting intraocular pressure for central corneal thickness does not improve prediction models for primary
James D Brandt1, Mae O Gordon, Feng Gao
1Department of Ophthalmology and Vision Science, University of California, Davis, CA, USA.
Ophthalmology
|June 28, 2011
Summary
Correcting intraocular pressure (IOP) for central corneal thickness (CCT) does not improve primary open-angle glaucoma (POAG) risk prediction in ocular hypertension. Using measured IOP and CCT is simpler and equally accurate for predicting POAG development.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Biostatistics
Background:
- Ocular hypertension is a risk factor for primary open-angle glaucoma (POAG).
- Accurate prediction models are crucial for managing ocular hypertension and preventing POAG progression.
- Central corneal thickness (CCT) can influence intraocular pressure (IOP) measurements.
Purpose of the Study:
- To evaluate if adjusting intraocular pressure (IOP) for central corneal thickness (CCT) enhances the baseline prediction model for primary open-angle glaucoma (POAG) development in ocular hypertensive patients.
- To compare the predictive accuracy of models using adjusted IOP versus unadjusted IOP.
Main Methods:
- Reanalysis of the Ocular Hypertension Treatment Study (OHTS) baseline prediction model for POAG.
- Substitution of unadjusted IOP with IOP adjusted by 5 different correction formulae for CCT.
- Cox proportional hazards models were used, with and without CCT, to assess predictive accuracy via c-statistic and calibration chi-square.
Main Results:
- Prediction models using IOP adjusted for CCT showed c-statistics ranging from 0.75 to 0.77, which was not superior to the original model (0.77) without IOP adjustment.
- All models demonstrated acceptable calibration.
- Both baseline IOP (adjusted or unadjusted) and CCT were statistically significant predictors in the models.
Conclusions:
- Adjusting intraocular pressure (IOP) for central corneal thickness (CCT) using correction formulae does not improve the accuracy of primary open-angle glaucoma (POAG) risk prediction in ocular hypertension.
- Simpler risk assessment using measured IOP and CCT is as effective as using adjusted IOP.
- Clinical decisions can rely on standard IOP and CCT measurements for POAG risk stratification.
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