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Visual Field Analyzers For Early Detection of Glaucoma

Visual Field Analyzers
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Have you been wondering what makes the best Visual Field Analyzers for early detection of Glaucoma? Is glaucoma treatable? Then, here is the ultimate guide on Glaucoma Diagnosis and the best Visual Field Analyzers’ price available to tell you all about it.

What Is Glaucoma?

A leading cause of blindness amongst people over the age of 60 years is Glaucoma. But prevention of blindness from this can be done by early treatment. Damage to the optic nerve caused due to a specific group of conditions in the eyes is Glaucoma. 

  • What Is The Main Cause Of Glaucoma?

Aqueous humor is something constantly made by our eyes. With the flow of this new aqueous in our eyes, a similar amount of old aqueous should flow out. This fluid is supposed to be drained out through the drainage angle. The pressure in our eyes is kept stable through this process. This fluid can build up if the drainage angle is not working properly. Thus, the optic nerve gets damaged by the rising pressure inside the eye.

  • How Do You Get Glaucoma?

Over a million nerve’s tiny fibres make up the optic nerve. Blind spots in one’s vision can get developed with the death of these nerve fibres. These blind spots only become prominent with the death of most of these nerve fibres. One can become blind when all these nerve fibres die.

The three major types of Glaucoma have been mentioned below:

1. Primary Open-Angle Glaucoma

Primary Open-Angle Glaucoma

What Is Primary Open-Angle Glaucoma?

One of the most common types of Glaucoma is Primary Open-Angle Glaucoma. 

The onset of this kind of glaucoma begins gradually. The eye cannot drain as much fluid as it should in this kind of glaucoma. The pressure built on the eye due to this reason starts damaging the optic nerve. No vision changes or pain is felt by the affected patient at first. People that are sensitive to eye pressure, even in normal scenarios are at greater risk of getting glaucoma.

Pressure develops on the optic nerve when the inner eye does not drain fluid properly leading to glaucoma. Early symptoms of this kind of Glaucoma include Tunnel Vision and Central & Peripheral Vision Blind Spots.

2. Angle Closure Glaucoma

Angle Closure Glaucoma

What Is Angle Closure Glaucoma?

When one’s iris is close to the angle of drainage in the eye, then there is a high chance of occurrence of Angle Closure Glaucoma. The drainage angle can end up getting blocked by the iris. Eye pressure begins to rise very quickly once there is complete blockage of this drainage angle.

Such a situation is commonly referred to as Acute Attack. Calling an ophthalmologist and reaching out for help is the best way to prevent going blind.

Some signs that one has been encountering an acute attack are as follows:

          • Sudden Blurry Vision
          • Severe Headache
          • Severe Eye Pain
          • Seeing Halos or Rainbows Around Lights
          • Vomits
          • Nausea
3. Normal-Tension Glaucoma
What Is Normal-Tension Glaucoma?

No eye pressure is felt in the case of normal-tension glaucoma. But the optic never still gets damaged. The drainage ducks function correctly, there is a wide enough gap between lens and iris, but the effect on the optic nerve is still prominent. Most people are often at greater risk of developing this kind of glaucoma.

  • What Happens If You Have Glaucoma?

What Is Glaucoma

One can distinguish whether or not they have glaucoma or what kind of glaucoma they have by referring to common symptoms. Some of these glaucoma symptoms have been given below.

      • Symptoms Of Open-Angle Glaucoma

No warning signs or obvious symptoms are prominent when people suffer from open-angle glaucoma. Blind spots develop in the eye’s side or peripheral vision as glaucoma progresses.

No noticeable vision changes have been witnessed by most open-angle glaucoma patients until instances of severe damage. This is one of the many reasons people often see glaucoma as the sight’s silent thief. However, visiting the ophthalmologist and having regular eye checkups or exams can help save one’s vision.

      • Symptoms Of Angle Closure Glaucoma

There are usually no symptoms before an acute attack occurs in the case of people that run the risk of getting angle-closure glaucoma. Halos, blurred vision, eye pain, and mild headaches are a few symptoms of this kind of glaucoma. Some other prominent symptoms include eye redness, decreased vision, and severe forehead pain.

      • Symptoms Of Normal-Tension Glaucoma

Patients suffering from eye pressure within normal ranges are suffering from normal-tension glaucoma. Despite having a high pressure termed ocular hypertension, people having normal-tension glaucoma show no signs of damage. They do run a higher risk of developing glaucoma though. Many people make considerable glaucoma patients even though they have normal eye pressure. This is a major reason why getting monitored by an ophthalmologist will make sense.

  • Who Is At Risk Of Glaucoma?

There are many people out there that run a higher risk of getting glaucoma. Some of these groups of people are as follows:

  • People Aged 40 Years & Above
  • African, Asian, or Hispanic Heritage People
  • People Having Glaucoma-Affected Family Members
  • High Eye Pressure
  • Near-Sighted or Far-Sightedness
  • Eye Injury
  • Long-Term Steroid Medications
  • Optic Nerve Thinning Patients
  • Centrally Thin Corneas
  • Migraine Patients
  • High-Blood Pressure Patients
  • Diabetics, etc.

Glaucoma Diagnosis: Diagnostic Exams and Treatments

Optometrists Screen For Glaucoma

Going through with complete examination of the eyes rather than just glaucoma screening is essential to truly diagnose glaucoma. Like in other eye diseases, effective management of the disease is made possible with early detection. From a series of tests to a comprehensive eye examination, a glaucoma diagnosis test can be done at the right time with the best optometrist by one’s side.

    • Diagnostic Exams: Besides checking eye pressure, the doctor might pour drops to examine the optic nerve by dilating the pupil. The doctor might do HRT, OCT, or GDx diagnostic machine tests for assessing or visualizing optic nerve damage. Such kind of examination can help the doctor assess any prior damage. 

If severe damage is witnessed, then vision changes can easily be detected by Vision Field Test. Usually, these minor vision changes are not noticed by affected patients until they suffer from significant vision loss. 

Once it is unveiled that the patient has glaucoma through Visual Field Testing or Optic Nerve Examination, treatment for the same is initiated.

    • Treatments: Nowadays, only lower intraocular pressure treatments are available out there. Medicines, surgery, and laser treatments are used to lower eye pressure. These treatments will be going on for life. Such treatments can help control Glaucoma but not cure it. Until now, there is no cure for this problem.

Eye drops are usually prescribed to the patient as part of the medication process. While some drops are supposed to be used once per day, there are others that will require dosing 3 to 4 times a day.

Laser treatments are as equally effective as eye drop treatments. Laser treatments are quick, simple, and effective eye pressure control procedures. These laser treatment procedures can control glaucoma patients’ eye pressure for over five years.

While a good number of surgeries are already available, new and advanced ones are being developed as well as evaluated. Most of these available surgeries are focused on helping advanced glaucoma patients. But some new ones are safe and secure for use in the case of newly diagnosed patients.

Most surgeons expect two basic results from glaucoma surgery procedures, be it non-laser or laser, to increase drainage and decrease intraocular acid production. Most of the time, these glaucoma surgery procedures can accomplish both results. 

The goal of glaucoma therapy and surgery is to stabilize and reduce intraocular pressure or IOP. Once this goal is accomplished, the damage to the optic nerve can be prevented to a good extent.

The choice of treatments a patient needs to opt for will depend on their personal needs and doctor’s recommendations. Although this disease cannot be cured, the right treatment procedures can surely protect the glaucoma patient from further loss of vision.

    • “Will I Go Blind?”

Whenever a patient is diagnosed with glaucoma, most newly discovered patients come up with one question common to them all, “Will I go blind?”

To be fair and square, the answer is “No”. Occurrence of blindness does happen for some patients, but it is quite rare. Sight impairment is a much more common issue faced by the people of the United States compared to blindness.

However, it is good to know that vision loss can still occur in the case of glaucoma patients despite the best treatments. For this reason, patients must follow their doctor’s instructions carefully and be consistent with their eye drops medication to draw a favorable outcome.

    • The Importance Of Early Glaucoma Diagnosis

Future complications related to glaucoma disease can be prevented through an early glaucoma diagnosis. The irreversible damage and significant problems related to glaucoma disease can be avoided or at least slowed down through regular eye examinations. Vision loss can be prevented through genuine treatments and regular eye examinations. Book an appointment with a reputed optometrist if you believe you have any of the above-mentioned symptoms of glaucoma or feel the need for a comprehensive eye examination.

How Do Optometrists Screen For Glaucoma?

Glaucoma can be screened through a series of comprehensive eye examinations conducted by optometrists. The optometrist will be performing numerous tests for screening glaucoma. Some crucial glaucoma-related factors that will be revealed during the glaucoma diagnosis test are:

      • Inner Eye Pressure
      • Optic Nerve’s Shape & Colour
      • Vision’s Complete Field
      • Eye Angle When Cornea’s Met With Iris
      • Cornea’s Thickness

Glaucoma or other concerning conditions will be determined through an eye examination. A specialized treatment will then be recommended by the optometrist once the glaucoma diagnosis is done. Understanding how such glaucoma diagnosis tests will serve different purposes is important too. So let us learn a bit more about them.

  • Tonometry: 

The internal eye pressure or IOP is measured through the tonometry test conducted by ophthalmologists. Three common methods of conducting the tonometry test have been discussed below.

      • Schiotz Method: The Schiotz Method involves desired eye treatment using anesthetized eye drops. Once all this is done, the ophthalmologist advises the patient to lie comfortably and concentrate on a fixed spot. This spot can be anywhere on the ceiling but it needs to be fixed. After this, the doctor will lower a ‘tonometer’ to take intraocular pressure reading of the anesthetized eye. He will continue the same examination on the other eye if needed.
      • Applanation Method: The force necessary for flattening the cornea’s portion is analyzed using the Applanation method. The patient will be expected to sit upright for success in this exam. A fine paper strip is gently touched on the eye’s side to introduce fluorescein or an orange dye into the eye. This process will stain the eye’s front and make it ready for examination. The eye is treated with drops of anesthesia once dyed. The eye will then only be exposed to a microscope with a slit lamp. Then, a tonometer present in the microscope is brought closer to the point that it begins touching the eye. The doctor then looks through an eyepiece and measures eye pressure.
      • Noncontact Method: True to its name, the noncontact method is a method in which the eye pressure is checked without physical contact with the eyes. The eye is not touched by any instrument directly in this method. The patient is asked to rest his chin and head on padded support. They will then be asked to stare right into the instrument used for examination on a targeted light source. Then, the air is blown to examine the intraocular pressure. By determining changes of light reflected by the cornea when the air is blown.
  • Ophthalmoscopy:

Ophthalmoscopy or Dilated Eye Exam is a procedure commonly used by doctors to examine any inflicted damage on the optic nerve caused due to glaucoma. Ophthalmologists use special eye drops to dilate the pupil to conveniently examine the optic nerve shape. 

Once the pupil dilates, the eye is exposed to a small device. This small device consists of light on its end. This enables the doctor to gain a magnified and cleared optic nerve view. If doctors discover an odd shape or size of the optic nerve or feel the pressure is not in range, they might ask the patients to go for Perimetry and Gonioscopy exams.

  • Perimetry: 

Perimetry is a visual field test for glaucoma that could help determine one’s complete vision map. Thus, helping doctors to make out if one’s vision has been affected by glaucoma. The doctor will simply ask the patient to look ahead and respond to the light’s movement. The light’s movement as and when the light passes through the patient’s side vision or peripheral vision. The doctor uses the outcome of this examination to map the patient’s vision.

Most doctors recommend their patients take perimetry tests repeatedly to see whether the results differ. Once a positive glaucoma diagnosis has been determined, the doctor recommends the patients take vision field tests at least two times a year to determine any significant changes.

  • Gonioscopy: 

The Gonioscopy glaucoma diagnosis test aims to determine the exact angle where the cornea is met by the iris. The primary purpose of this examination is to check whether it is wide enough, open, narrowed, or closed down. The doctor gently places a handheld contact lens after numbing the eye with a specific eye gel. The doctor can easily check the angle between the cornea and iris using a mirror on the handheld contact lenses.

  • Pachymetry:

A simple and painless way of measuring the cornea’s thickness using a probe called a pachymeter is called Pachymetry. Eye pressure reading can enormously be impacted by corneal thickness. Thus measuring the corneal thickness is crucial. Measuring IOP using the Pachymetry method only takes a couple of minutes or less.

What’s Next?

Once the glaucoma diagnosis has been made, reaching out to the best glaucoma specialist becomes necessary. Why? Because the accuracy of statistics delivered by the best doctor will help determine the gravity of the situation in a much better way.

Why You Should Prefer Visual Field Test For Glaucoma?

Visual Field Test For Glaucoma

Do you ever wonder about what all you can see through your eye’s corners? Are you sure and can tell what is presently happening in your surroundings? Then, measuring your vision field through a visual field test for glaucoma would ideally make sense.

A visual field refers to the area one’s eye can see when the person is asked to focus on a particular central point. On the other hand, visual testing is how ophthalmologists measure how much vision field either of the eyes has, and the vision loss has occurred.

  • What Is A Visual Field Test?

A wide area of space can be seen generally in front of us. When we are looking in one direction, say straight ahead, we aren’t just able to see what is right ahead of us but also below, above, and what’s off to either side of us. One can refer to this vision as peripheral vision. And the entire visible area is known as the visual field.

One’s vision is usually perfect in the visual field’s middle. This is why most people turn their eyes toward the objects they want to see. The farther the object is from central vision, the less clear the object will be visible. The farther away the object gets from one’s central vision, the more it seems to have disappeared.

A visual field test for glaucoma will mainly measure two things:

        • The left, right, above, and far up the visibility of an individual without moving the eyes.
        • The sensitivity of the vision in different parts of one’s visual field.
      • Visual Field Testing & Blind Spots

Scotoma or Blind Spots can be determined through visual field testing. The shape and size of the scotoma will reveal how one’s vision is affected by a brain disorder or eye disease. For instance, if a patient has been suffering from glaucoma disease, then this glaucoma diagnosis test might reveal any possible side or peripheral vision loss as a result of glaucoma disease.

Many ophthalmologists use vision field tests to determine limitations in the patient’s vision caused due to eyelid problems like droopy eyelids and ptosis.

      • Six Types Of Visual Field Testing
        • Automated Static Perimetry Test:

Automated Static Perimetry Test enables the ophthalmologist to develop a detailed map of where the patient can see and not see. Glaucoma usually affects peripheral vision; this glaucoma diagnosis test will reveal any loss of vision outside their central visual field. 

        • Confrontation Visual Field Test

The doctor can screen any visual field-related problems using the confrontation visual field test for glaucoma. In this glaucoma diagnosis test, the doctor will ask the patient to focus his eyes on one object, such as his nose. Then, he will hold up fingers of different numbers in the patient’s peripheral visual field and ask the number you see.

        • Frequency Double Perimetry

Frequency Double Perimetry is another test used by ophthalmologists to assess any significant vision loss in a patient. The damage to the patient’s vision is checked using an optical illusion. If the patient faces difficulty during this glaucoma diagnosis test, the test will simply reveal vision loss in some parts of the patient’s visual field.

        • Kinetic Visual Field Test

Kinetic Visual Field Test is quite similar to the perimetry visual field test for glaucoma diagnosis. Instead of blinking lights as in the case of perimetry testing, this specific visual field test for glaucoma will be using blinking lights.

        • Amsler Grid

Amsler Grid is one basic visual test for measuring the patient’s central vision. Vision changes can be monitored using this simple and helpful glaucoma diagnosis test tool in case of AMD or Age-Related Macular Degeneration.

        • Electroretinography

In case of some specific retina conditions, an ophthalmologist may recommend his patient to take ERG or electroretinography test to determine any significant vision loss. Electrical signals of the patient’s eye’s light-sensitive cells or photoreceptors in the retina and some other cells are measured using this test.

  • How To Know If You Visual Field Testing Is Necessary?

Visual Field Testing

Visual Field Testing lets the doctor discover any early signs of diseases such as glaucoma and gradual vision damage. Many glaucoma patients have opened up about their personal experiences in glaucoma. They have said they never noticed any signs or felt any concerning problems with their vision. This is when taking a visual field test for glaucoma diagnosis will reveal any loss in the peripheral vision.

The doctor can also analyze the part of the patient’s nervous system that enables the patient to see. The optic nerve, retina, and brain make the main visual parts of the patient’s nervous system. Visual field changes can determine whether patients face problems with these visual parts. Doctors will also reveal whether or not the disease or injury has become better or worse by having visual field tests more often.

  • Why Do Some People Need To Go For Visual Field Testing Often?

Some doctors might not be satisfied with the accuracy of the first visual field test results. So, they might ask the patient to take a visual field test repeatedly. He might also ask him to actively participate during the glaucoma diagnosis test to avoid unreliable and non-satisfactory results.

Doctors can even ask their patients to retake visual field tests in a week, a month, or a year. The main objective behind this is that the doctors want to ensure that everything is fine and no new problems have come up. 

Once glaucoma has been diagnosed, most doctors will regularly perform visual field tests to reveal whether or not their treatment is working well on the patient. Visual field tests play a crucial role in glaucoma diagnosis, from detecting any significant loss in vision to the effectiveness of the treatment prescribed by the doctor.

  • What Do The Results Of This Test Mean?

“Normal” visual test results mean that the tested patient can see around the edges and the center of the visual field just as any other regular and healthy person.

Visual Field Test that indicates vision field loss simply means that the patient’s vision in some specific areas is not normal or as sensitive. This could further mean that the patient has lost a little vision in a small area. Or, loss of all vision in a large area of the eye.

Visual Field Test measures the loss of vision and the affected areas. The results of the visual field test are printed as patterns of numbers and dots. The doctor can analyze these numbers and dots to determine if the patient is suffering from a disease or needs additional testing, diagnosis, recommendation, or treatment.

Top 10 Visual Field Analyzers For Early Detection Of Glaucoma

Some visual field test machines for early detection of glaucoma or visual field analyzers for glaucoma diagnoses are as follows:

1. Heidelberg Edge Perimeter ($5,250.00)

Heidelberg Edge Perimetry

Heidelberg Edge Perimeter’s the latest device used for assessing the patient’s visual field by ophthalmologists. This one-of-a-kind flicker perimeter uses a stimulus called the Flicker Defined Form. Many studies have shown how Heidelberg Edge Perimeter can reveal visual field loss earlier than standard visual field tests.

2. Octopus 600 Perimeter ($7,888.00)

Octopus-600

Octopus 600 is an easy-to-use device that aims to fulfill all essential perimetry needs of the doctor. The swiss-made machine makes best fits rapid screening and central field static testing. This easy-to-read analysis software can also integrate with EyeSuit software to deliver the best results.

3. Octopus 900 Perimeter ($2,999.00)

octopus 900

One of the fullest field projection perimeters available, delivering complete 90-degree results, is the Octopus 900 Perimeter. Be it early detection of the disease, progression tracking, or performing sensitive examination when on the disease’s end stage, Octopus 900 Perimeter Basic is another great choice.

4. Nidek MP 3 ($7,777.00)

Nidek MP 3

Another one of the best-automated perimetry machines available out there is the Nidek MP3. What makes these visual field analyzers for glaucoma machines so unique is the fact that it helps in auto-tracking the fundus. Thus, helping in the patient’s fixation’s constant tracking. The device can even measure perimetry within less than just one degree of the visual field.

5. Optopol PTS 2000 ($9,000.00)

optopol pts 2000

Optopol PTS 2000 helps take quick screening and manually controlled kinetic perimetry tests. This modern diagnostic instrument offers fast and precise visual field analyzers. Thus, not only saving time for the doctor but also delivering cutting-edge reliability and precision. 

6. Humphrey Matrix 800 ($7,900.00)

Humphrey Matrix 800

Humphrey Matrix 800 visual field test machine can also determine visual field loss. This machine makes an ideal solution for fast threshold testing and case detection. The machine simplifies the visual field testing process and detects visual field loss usually missed when calculated using other methods or machines.

7. Centervue Maia ($9,093.00)

centervue maia

One of the latest advancements in microperimetry confocal is the visual field testing machine Centervue Maia. This machine can acquire retinal images, track real-time eye movements, and is non-mydriatic.

8. Eyestar 900 ($6,600.00)

Eyestar 900

Eyestar 900 can measure, take images, and diagnose the patient’s eye. Its OCT-based eye analyzer comes equipped with swept-source technology, thus enabling cornea-to-retina biometry of the patient’s entire eye.

9. Centervue iCare Compass ($13,990.00)

Icare compass

iCare Compass is a standardized and automated perimetry device that features active retinal tracking for patients having poor real-time fixation. This device is capable of clicking high-resolution confocal images of the retina.

10. Lenstar LS 900 ($6,900.00)

Lenstar LS 900

Lenstar LS 900 visual field testing machine makes a suitable choice for highly accurate and precise laser optic measurements for almost all eye parts. This device is also the first optic biometer available in the market to measure crystalline lens thickness.

Conclusion

Early glaucoma diagnoses Using OCT for Glaucoma has saved millions of people from unexpected vision loss. It has helped limit their opportunities and live healthier and happier life longer than expected.

So, now that you know all about glaucoma diagnosis and visual field test machines for its early diagnosis, we hope you will not sit back and limit yourself from making the right choice by taking visual field analyzers for glaucoma by approaching the best ophthalmologist near you.

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