Perimetry (vision Field)
In a simple definition, you can say that the field of vision is the viewing distance around the body you are staring, while your eyes are steady.
This test is done at Bina eye Hospital with advanced System (Humphrey). This device is a hollow white hemisphere 30 cm away from the patient's face.
The purpose of this test
The vision field is one of the unique features of the eye which provides a functional view of the function of the various parts of the visual system (Eyes, vision and visual cortex in the brain). Hence, the assessment of the visual field determines the state of vision which can be due to retinal diseases (the effects of some ophthalmic drugs such as hydroxychloroquine), glaucoma, visual acuity and intracranial vision injuries and its disturbances.
Pre-test actions
Before doing this test, don’t drop pupillary droplets in the eye let it take 24 hours to have its effect gone.
No need to be NPO and it is better to have breakfast or lunch. This test requires full patient collaboration, which is why it is necessary to be good, not being sleepy and tired during the general test.
Steps
Because each eye has its own vision field, the visual field test is also done in single eye.
1- First, the optometrist enters the patient information and the corresponding image on the device.
2- Each eye is examined individually. First, a special cover closes eye, so that no light is felt and a special alarm is given to the patient As soon as it felt the spotlight turned on, should press the alarm.
3-During the test, you should put your head and chin in special place the eyes have no movement, but there is no ban on blinking.
4- After placing the appropriate lens in the device, the patient will put his head in the proper position and after being placed in the most comfortable position the photo is taken in the following two steps:
a- At first, four bright points appear in front of the patient, with a series of flashing light points in the center of them. At this stage, the patient should ring the alarm as soon as the flashing light is lit.
b- Eventually, a bright yellow light turns on in the porthole facing the patient and the test goes on while the patient is staring at the yellow light inside the vent. Patient should focus on the entire space inside the hemisphere so that if the flashing light is lit from every point inside it, immediately ring the alarm. At this stage, the important point to be followed by the patient is stopping movement of the eyes.
Complications after the photo
There will be no problems due to no drop before the photo.
Place and hours
Every day except holidays from 11 am to 12:30 pm
The duration of the test varies depending on the level of patient collaboration, but the approximate duration for each eye, about 7 minutes and for the two eyes, is approximately 15 minutes.
Main Building - Second Floor – Paraclinic