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09:03
Trabecular Meshwork Response to Pressure Elevation in the Living Human Eye
Published on: June 20, 2015
Dynamic contour tonometry in asymmetric glaucoma patients.
Emilio Rintaro Suzuki1, Cibele Lima Belico Suzuki, Danielle Carlier
1Glaucoma Service, Santa Casa de Belo Horizonte, MG, Brazil.
Clinical Ophthalmology (Auckland, N.Z.)
|April 27, 2012
Summary
Dynamic contour tonometry revealed higher intraocular pressure in the worse eye of glaucoma patients, despite similar applanation intraocular pressure. Ocular pulse amplitude showed no significant differences, suggesting DCT may detect subtle asymmetry.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Ocular Biomechanics
Background:
- Glaucoma is characterized by progressive optic nerve damage.
- Intraocular pressure (IOP) is a primary risk factor for glaucoma.
- Asymmetric glaucoma presents challenges in monitoring disease progression.
Purpose of the Study:
- To compare dynamic contour tonometry (DCT) and ocular pulse amplitude (OPA) in asymmetric glaucoma patients.
- To investigate differences in these parameters when applanation IOP is similar between eyes.
Main Methods:
- Prospective, observational study involving 30 glaucoma patients and 11 controls.
- Measurements included applanation IOP, dynamic contour tonometry IOP, and ocular pulse amplitude.
- Glaucoma patients were predominantly on prostaglandin analog treatment.
Main Results:
- No significant differences in ocular pulse amplitude were found between control and glaucoma groups, or between the worse and better eyes.
- Dynamic contour tonometry showed a 2.44 mmHg higher IOP in the worse eye compared to the better eye in glaucoma patients, despite similar applanation IOP.
- Corneal thickness and applanation IOP were comparable between eyes in controls.
Conclusions:
- Dynamic contour tonometry may detect subtle IOP asymmetry in glaucoma patients not apparent with applanation tonometry.
- The observed DCT IOP difference warrants further investigation for its relation to glaucoma progression and prognosis.
- OPA is not a reliable indicator of asymmetry in this context.
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