The intraocular pressure (IOP) is a central parameter in the diagnosis and monitoring of glaucoma. However, not all measurement methods yield the same values, and each has its own particularities.<\/p>\n\n
Many patients become concerned when different devices produce different results. As an ophthalmologist, I explain the differences between Goldmann applanation tonometry, non-contact tonometry (“air-puff measurement”) and iCare \u2013 and how reliable these methods really are in everyday clinical practice.<\/p>\n\n
An increased intraocular pressure is the most important modifiable risk factor in glaucoma. The aim of every treatment is to achieve the individual target pressure and maintain it long-term to protect the optic nerve.<\/p>\n\n
However, intraocular pressure fluctuates throughout the day and is affected by various factors. This makes reliable measurement all the more important.<\/p>\n\n
The IOP measurement determines treatment decisions: Should treatment begin with eye drops? Is laser treatment required? Is surgery necessary?<\/p>\n\n
The success of treatment is also judged by changes in pressure. Therefore, an exact, reproducible measurement is essential.<\/p>\n\n
This method is considered the reference standard. After administering a topical anesthetic drop, the cornea is gently flattened with a small measuring probe. The force required for applanation is expressed in mmHg. Advantages:<\/p>\n
Disadvantages: The method requires rest, cooperation, and a well-hydrated cornea. In cases of pronounced corneal astigmatism or thickness, the measured value may vary.<\/p>\n\n
At B\u00e1nyai Augenheilkunde, the Goldmann measurement is used specifically for complex or critical cases.<\/p>\n\n
In addition, our diagnostics take into account the central corneal thickness (pachymetry), which can affect the measurement. This enables us to detect and correctly interpret falsely high or low values.<\/p>\n\n
This method uses a short air pulse to flatten the cornea. It is fast, hygienic, and comfortable \u2014 but somewhat less precise:<\/p>\n
However, it is susceptible to interference from an unsteady gaze, a dry ocular surface, or excessive eyelid activity.<\/p>\n\n
Values tend to be slightly higher than with Goldmann. Therefore, it is usually not used alone for follow-up examinations or treatment decisions.<\/p>\n\n
In screening situations, however, it can help quickly identify patients with abnormalities \u2014 for example, during occupational health screenings or in nursing facilities.<\/p>\n\n
The iCare device uses a small probe that briefly touches the eye\u2014no anesthesia required. Ideal for use at home, on the go, or with children and elderly patients. Advantages:<\/p>\n
The values are reliable but may vary slightly depending on the application. Proper handling is crucial.<\/p>\n\n
For patients with normal-tension glaucoma or markedly fluctuating pressure measurements throughout the day, iCare provides a valuable complement \u2014 especially when other methods are difficult to perform.<\/p>\n\n
Situation<\/strong><\/td>| Recommended method<\/strong><\/td><\/tr> | Standard preventive care<\/td> | Non-contact or iCare<\/td><\/tr> | Monitoring during therapy<\/td> | Goldmann<\/td><\/tr> | Suspected glaucoma attack<\/td> | Goldmann<\/td><\/tr> | Measurements for children or at home<\/td> | iCare<\/td><\/tr> | Assessment of tendency at first contact<\/td> | Combination of multiple methods<\/td><\/tr><\/tbody><\/table><\/figure>\n\n | What patients should know about the methods<\/h2>\n\nDifferences between methods often cause uncertainty. It is important to know that no single measurement determines a diagnosis or treatment.<\/p>\n\n Ophthalmologists always assess the overall situation \u2013 including the optic nerve, visual field, OCT, and the personal circumstances of female patients.<\/p>\n\n At B\u00e1nyai Augenheilkunde, you will receive a detailed assessment of your pressure measurements \u2013 taking into account all relevant factors. This allows individual fluctuations to be properly interpreted.<\/p>\n\n Especially with glaucoma symptoms such as a sensation of pressure or reduced vision, the choice of measurement method is crucial.<\/p>\n\n |