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Goldmann versus Disposable Applanation Tonometer Tips in Glaucoma Patients and Normal Subjects
1a Ophthalmology Department, Faculty of Medicine , Cairo University , Cairo , Egypt.
Current Eye Research
|April 4, 2015
Summary
Goldmann applanation tonometry and disposable Luneau SA prisms show similar intraocular pressure (IOP) measurements. However, the disposable prisms exhibited systematic inaccuracy in normal subjects, unlike glaucoma patients.
Area of Science:
- Ophthalmology
- Glaucoma Research
- Ophthalmic Device Evaluation
Background:
- Intraocular pressure (IOP) is a critical factor in glaucoma management.
- Accurate IOP measurement is essential for diagnosis and monitoring.
- Goldmann applanation tonometry is the established standard for IOP measurement.
Purpose of the Study:
- To compare the agreement of intraocular pressure (IOP) measurements between Goldmann applanation tonometry and disposable Luneau SA applanation prisms.
- To evaluate potential differences in measurement agreement between glaucoma patients and normal subjects.
Main Methods:
- A prospective comparative study involving primary open-angle glaucoma (POAG) patients and age-matched normal subjects.
- Intraocular pressure (IOP) was measured using both Goldmann and disposable Luneau SA (Tonojet) applanation tonometry prisms.
- Bland-Altman plots and regression analysis were employed to assess measurement agreement and identify systematic inaccuracies.
Main Results:
- The mean difference in IOP measurements between the two prisms was similar in both glaucoma (2.0 ± 2.0 mmHg) and normal (2.1 ± 1.7 mmHg) groups.
- Significant bias was observed in both groups (p < 0.0001).
- Measurement inaccuracy was non-systematic in glaucoma patients but systematic in normal subjects.
Conclusions:
- The agreement patterns between disposable and Goldmann applanation tips differ between glaucoma patients and normal subjects.
- The use of the standard Goldmann applanation tip is recommended for IOP measurements in glaucoma patients due to observed systematic inaccuracies with disposable prisms in normal subjects.
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