Perimetry
Dr Rajeev Raut Eye Clinic Raut Eye Care

Read the article to know more about Perimetry

Reviewed by
Dr. Aditya Raut M.B.B.S D.O.MS
Updated on Mar 08  •  2 mins read
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What is Perimetry

Perimetry is a medical procedure used to measure the extent and function of a person's peripheral vision.It is a diagnostic test used to detect any abnormalities in the field of vision or peripheral vision.

It is also used to detect and diagnose vision problems such as glaucoma, retinal diseases, and brain damage.During the procedure, the patient looks straight ahead into a machine and is asked to identify various shapes, flashes of light, or other visual stimuli that appear in the peripheral vision field.

The results of the test are displayed on a graph, which is used to measure the peripheral vision and look for any blind spots or areas of reduced vision.Perimetry is a safe and painless procedure that can help diagnose and monitor vision problems.


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When to do Perimetry

  1. Perimetry is a medical test used to measure the field of vision of a person. It is mainly used to detect abnormalities in the visual field, such as blind spots or other issues.
  2. Perimetry should be done in individuals of all ages, especially those who are at risk for vision loss due to a variety of conditions, such as glaucoma, macular degeneration, and diabetic retinopathy. It is especially important for those with a family history of these conditions, as well as those who experience sudden changes in vision.
  3. If a person experiences any of the following symptoms, they should seek medical attention urgently for perimetry: sudden vision loss, blurry vision, double vision, halos around lights, and blind spots in the field of vision. Additionally, if a person experiences any other changes in vision, such as decreased night vision, they should consult a doctor for a perimetry test.

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Diseases in which Perimetry is done

  1. Glaucoma: Perimetry can be used to measure the extent of field loss associated with glaucoma, helping to distinguish between different types of glaucoma and monitor progression of the disease.
  2. Diabetic Retinopathy: Perimetry can be used to evaluate the extent of any visual field defects that may be associated with diabetic retinopathy, aiding in the diagnosis and management of the condition.
  3. Macular Degeneration: Perimetry can be used to detect any small changes in the visual field that may indicate macular degeneration, helping to monitor the progression of the disease.
  4. Optic Neuritis: Perimetry can be used to detect any small changes in the visual field that may indicate optic neuritis, helping to differentiate between optic neuritis and other causes of visual loss.
  5. Uveitis: Perimetry can be used to determine the extent of any visual field defects that may be associated with uveitis, aiding in the diagnosis and management of the condition.
  6. Optic Neuropathy: Perimetry can be used to detect any small changes in the visual field that may indicate optic neuropathy, helping to differentiate between optic neuropathy and other causes of visual loss.
  7. Retinal Vein Occlusion: Perimetry can be used to determine the extent of any visual field defects that may be associated with a retinal vein occlusion, aiding in the diagnosis and management of the condition.
  8. Central Serous Retinopathy: Perimetry can be used to detect any small changes in the visual field that may indicate central serous retinopathy, helping to differentiate between central serous retinopathy and other causes of visual loss.
  9. Retinitis Pigmentosa: Perimetry can be used to measure the extent of field loss associated with retinitis pigmentosa, helping to distinguish between different types of retinitis pigmentosa and monitor progression of the disease.
  10. Retinal Detachment: Perimetry can be used to detect any small changes in the visual field that may indicate retinal detachment, helping to differentiate between retinal detachment and other causes of visual loss.

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Symptoms that require Perimetry

  1. Blurred Vision: Perimetry is indicated when a patient experiences an inability to see clearly, as if the objects in their vision are blurry.
  2. Double Vision: Perimetry can be used to evaluate when a patient experiences seeing two of the same object at the same time.
  3. Difficulty Focusing: Perimetry can be used to determine if a patient is having difficulty focusing their vision on a particular object.
  4. Tunnel Vision: Perimetry can be used to evaluate for tunnel vision, which is when a patient's peripheral vision is reduced or blocked by a dark tunnel-like sensation.
  5. Shadowy or Dark Areas: Perimetry can be used to determine if a patient is experiencing any shadowy or dark spots in their vision.
  6. Difficulty Seeing at Night: Perimetry can be used to evaluate if a patient is having difficulty seeing at night or in low light conditions.
  7. Difficulty Seeing Color: Perimetry can be used to evaluate if a patient is having difficulty seeing color, such as not being able to differentiate between shades of the same color.
  8. Vision Loss: Perimetry can be used to evaluate if a patient is experiencing vision loss, which is when a patient has a decrease in their vision.
  9. Eye Pain: Perimetry can be used to evaluate if a patient is having any pain in the eyes or around the eyes.
  10. Headaches: Perimetry can be used to evaluate if a patient is having recurrent headaches that may be related to vision issues.

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How Perimetry is done

  1. Perimetry is a test to check your vision field. It will help us diagnose any vision problems you may have.
  2. During the test, you will be seated in a darkened room, with your head resting against a chin rest. You will be looking straight ahead at a white dome-shaped object.
  3. The automated equipment will then project a sequence of lights at different locations around the dome. When you see a light, you will press the button. The machine will keep track of each light you see and create a map of the area you can see.
  4. At the end of the test, we will review the results to get an idea of how well you can see in different areas around you. This will help us determine if you have any vision problems and decide on the best course of treatment.

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How long will Perimetry take

  1. .
  2. The Perimetry test usually takes between 10 and 15 minutes to complete. The results of the test will be available within 2-4 days. If you need the results sooner, please let us know and we will do our best to accommodate your request.

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Reviewed By

Dr.Aditya Raut, MBBS, DOMS, Cataract and Refractive Surgeon, with experience of over 3000 cataract surgeries.

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Article Reviewed by Dr. Aditya Raut M.B.B.S D.O.MS Cataract Lasik and refractive surgeon
Specialist in number reduction surgery, Refractive Lens exchange and ICL surgery.

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