Visual field examinations

Visual field is the part of space that is visually perceived while the eye fixes straight ahead on a fixed point.

Printout of findings with the Heidelberg Edge Perimeter (HEP)

HEP findings printout

HRT & HEP Structure-Function Findings Printout

HRT& HEP Structural-Functional Findings Printout

Visual Field Examination is a functional analysis that measures whether any visual field defects or limitations exist. The examination takes several minutes. The patient is usually in a separate quiet, dark room so as not to be distracted by the noise of the practice. Only one eye is examined at a time, while the other is covered with an eye patch. The result of the visual field examination depends very much on the cooperation and concentration of the patient. For the patient, this test is often very tiring and time-consuming, but it is the only method of actively measuring visual function.

Automatic static perimetry (computer perimetry)

Automatic Static White-on-White Perimetry (SAP) is the most commonly used method of visual field measurement in the world. It measures how sensitive the retina is to light stimuli at specific locations.

Flicker-defined form perimetry


Flicker-Defined-Form (FDF) perimetry is a brand new method of visual field measurement offered only on the Heidelberg Egde Perimeter (HEP).

A stimulus is presented as a circular area flickering in antiphase to the background. When the visual system is functional, the patient perceives the illusion of a gray ring along the boundary of the stimulus (edge).

Each visual field examination requires the active assistance of the patient. Throughout the examination, the patient fixes a point in the center of a screen or projection surface. Appearing test stimuli or light stimuli are displayed in random order at different positions and with different intensities. When the patient notices a luminous stimulus, he presses a signal button. If the button is not pressed during a luminous stimulus, the intensity is first increased. If the person fails to perceive the dot again, the computer registers a visual field failure at the position and continues at another location in the visual field. The measurement result is then compared with a database of standardized normal findings and gives a value for each test position in the visual field.


We would like to point out that Heidelberg Engineering, as the equipment manufacturer, does not perform any examinations. A professionally performed ophthalmological examination can and may only be performed by your treating ophthalmologist and is absolutely necessary for an exact diagnosis, therapy recommendation as well as progress monitoring.Heidelberg Engineering cannot answer questions about individual clinical pictures or make diagnoses. In these cases, please contact your treating ophthalmologist or an eye clinic.

The diagnostic devices from Heidelberg Engineering provide support for your treating ophthalmologist in making a diagnosis. Please note, however, that no diagnostic decision should be made on the basis of a single examination.

For the clinical evaluation of a patient, your doctor should always get a comprehensive picture of the patient. For this reason, it will always include additional clinical information such as z. B. Include family history, disease progression, vision, intraocular pressure or a slit lamp exam in his diagnosis.

Heidelberg Engineering makes no claim to completeness of data. This Internet page is purely a knowledge platform, which is intended to serve as a basis for information. We assume no liability for the content of further links.


Heidelberg Engineering GmbH
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69115 Heidelberg

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