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Falsely elevated intraocular pressure due to increased central corneal thickness
A M Bron1, C Creuzot-Garcher, S Goudeau-Boutillon
1Department of Ophthalmology, University of Burgundy, Dijon, France. BronAl@AOL.com
Summary
Ocular hypertensive individuals often have thicker corneas than glaucoma patients or healthy subjects. Corneal thickness measurement is recommended for ocular hypertension to ensure accurate intraocular pressure readings.
Area of Science:
- Ophthalmology
- Corneal Physiology
- Glaucoma Research
Background:
- Intraocular pressure (IOP) is a key factor in diagnosing and managing glaucoma.
- Central corneal thickness (CCT) can influence IOP measurements.
- Ocular hypertension (OHTN) is defined by elevated IOP without optic nerve damage.
Purpose of the Study:
- To determine if individuals with ocular hypertension exhibit greater central corneal thickness compared to other groups.
- To investigate the relationship between corneal thickness and intraocular pressure measurements in different ocular conditions.
Main Methods:
- A prospective study involving 48 subjects with ocular hypertension, 63 with open-angle glaucoma, 56 with diabetes mellitus, and 106 controls.
- Central corneal thickness measured using ultrasound pachymetry.
- Intraocular pressure measured via Goldmann applanation tonometry.
Main Results:
- Ocular hypertensive subjects had significantly higher CCT (592±39 µm) than glaucoma patients (536±34 µm), diabetic patients (550±31 µm), and controls (545±33 µm) (P<0.001).
- No significant difference in CCT was found among glaucoma, diabetic, and control groups (P>0.05).
Conclusions:
- Elevated transcorneal IOP measurements in some individuals may be due to thicker corneas.
- Corneal pachymetry is advised for ocular hypertensive patients to identify abnormally thick corneas causing falsely high IOP readings.
- This finding aids in accurate diagnosis and management of glaucoma and ocular hypertension.