Intraocular Pressure Control (IOP) and Visual Field Test

hvfa

An increased intraocular pressure (IOP) may develop eye diseases such as glaucoma, which damages the optic nerve and causes visual field loss. Early diagnosis and early treatment are keys to prevent severe vision loss.

The eye pressure is measured in millimetres of mercury (mmHg), and is considered normal between the ranges of 12 to 21 mmHg; therefore when the IOP is above than 21 the person has an ocular hypertension, which is a risk factor for glaucoma.

Usually vision loss occurs when too high eye pressure causes irreversible damage to the optic nerve, initially affecting the periphery of visual field.

To rule out the risk of developing glaucoma, it is important to perform a visual exam every year; especially if you have in your family history someone who had glaucoma or ocular hypertension condition.

The visual field perimeter is the most important assessment of the visual field, to know the status of macular scotoma (if AMD), its location and its extension diagnostic test. 

 

A computerized perimeter is an advanced tool that presents light stimuli of different intensities, that studies the response of the patient to assess possible changes in his own visual field.

This test is used to control the evolution of glaucoma, retinitis pigmentosa, neurophysiological diseases, and lesions of the optic pathway… etc. The computerized Humphrey perimeter is one of the most used in current clinical optometry.

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