Humphrey Automated Perimetry

SERVICES

What is Automated Perimetry?

Automated Static perimetry is the most important clinical tool for measuring visual function outside the fovea.Threshold testing involves precise quantification of visual sensitivity.while suprathreshold testing is used mainly to establish whether visual function is within the normal range.

When is Perimetry Called for?

Perimetry is essential in glaucoma management.It is frequently useful in diagnosing and managing neurological diseases, and is has a role in the diagnosis and treatment of many retinal diseases.Perimetry is also used to certify visual function in patients with vision disabilities.

GLAUCOMA

Perimetry is fundamental in diagnosing and managing glaucoma.Test results that reproducibly demonstrate field loss are the most conclusive and concrete means of establishing a diagnosis of chronic open-angel glaucoma.The best currently available method of following the progression of the disease is repeated visual field testing.Imaging the optic disk or retinal nerve fibre layer is also important,but it cannot replace perimetry in evaluating glaucoma patients.

NEUROLOGICAL DISEASE

Quantitative visual field testing is of great value in diagnosing and managing neurological disease,when it comes to managing neurological disease,field testing is not as crucial a technique as it is in glaucoma managment;neuroimaging can often replace perimetry.

RETINAL DISEASE

Visual field testing has a role in diagnosing and treating many retinal diseases,but direct observation of the fundus through ophthalmoscopy is usually of greater value in retinal diagnosis.Perimetry then becomes one of many ancillary tests.Visual field testing does provide a means for following the functional influence of many retinal diseases.

How the test performed?

Patient is comfortably seated in front of the equipment.He is asked to see at a fixed Spot of light in the centre of an illuminated globe.Repeated small illuminated dots are shown by the machine,the patient has to press a button whenever he visualize the spot of light.The sophisticated computer analyses the data and gives a printout of its analysis to be interpreted by the treating doctor.