The tonometry results they know each other immediately. The average value of Intraocular pressure which is considered normal is 15 mmHg, accepting as upper limit 20 mmHg. However, this value can be changed throughout the day in different measurements, since there are different factors that can influence such as position, or night / day measurements.
Although there are patients with glaucoma that do not present elevations superior to 20 mmHg, the fact of presenting an ocular hypertension already supposes an increased risk of developing glaucoma.
There are values that imply more or less seriousness. So it should be considered that:
- Measurements above 30-40 mmHg, require urgent treatment by the ophthalmologist.
- Measurements between 25-30 mmHg, they require a surveillance in the days after the test, and in the case of checking that they are maintained it is necessary to start the treatment.
- Measurements between 20-25 mmHg they are high values, they require tonometries of control for the surveillance and detection of possible increases of pressure.
All these values must be placed in the context of each individual and its symptoms for its correct interpretation by the specialist, since the ocular tension can also vary depending on other factors such as corneal thickness. Therefore, the abnormal results of a tonometry indicate only that there is a risk, but it is necessary that the ophthalmologist make a global assessment of the health of the eyes to confirm if there is any type of problem and it is necessary to initiate a treatment.