HVF 24-2 This is ordered for 90% of glaucoma patients. This is your baseline exam that all glaucoma suspects and glaucoma patients need at routine intervals. HVF 10-2 This is ordered for the 10% of glaucoma patients who are so advanced that the HVF 24-2 is mostly black, with only a central island of remaining vision.
What is HVF 24 2 glaucoma?
HVF 24-2 This is ordered for 90% of glaucoma patients. This is your baseline exam that all glaucoma suspects and glaucoma patients need at routine intervals. HVF 10-2
What is the difference between a 24-2 and a 30-2 HVF?
In most cases, the 24-2 testing strategy provides information comparable to that provided by the 30-2 strategy in a shorter time and with less variability. A 30-2 HVF may be warranted in patients under observation for evolving idiopathic intracranial hypertension.
What can an HVF tell you about a patient?
It has a wider angle and can capture peripheral field defects. Name, demographics, etc: Make sure you are looking at the right patient! Fixation loss: The HVF will routinely flash dots in the patient’s physiological blind spot to check if the patient has his / her gaze fixated on the center.
What is HVF 10 2 used for?
HVF 10-2 This is ordered for the 10% of glaucoma patients who are so advanced that the HVF 24-2 is mostly black, with only a central island of remaining vision. Macular diseases including plaquenil toxicity exams also need 10-2. HVF 30-2
How do you read Hvf results?
A typical "normal" dB reading is around 30. The numeric dB graph should be studied next. The dBs tested by the Humphrey analyzer range between 0 and 50 dB (0 is the brightest and 50 is the dimmest). A value of 0 means the patient could not see the brightest target, and a 50 means the dimmest target was seen.
What is Hvf eye test?
A visual field test measures how far the eye sees in any direction without moving and how sensitive the vision is in different parts of the visual field. This helps doctors to find certain types of injuries and disease, like glaucoma. Appointments 216.444.2020.
How many degrees is a 24-2 visual field?
24-2: Measures 24 degrees temporally and 30 degrees nasally and tests 54 points. Used for neuro-ophthalmic conditions and general screening as well as early detection of glaucoma. 30-2: Measures 30 degrees temporally and nasally and tests 76 points. Used for general screening, early glaucoma and neurological conditions.
What is a normal visual field test result?
A normal visual field is an island of vision measuring 90 degrees temporally to central Fixation, 50 degrees superiorly and nasally, and 60 degrees inferiorly. Visual acuity increases from movement discrimination in the extreme peripheral vision to better than 20/20 in the center of vision.
What is a normal eye pressure?
While the average eye pressure is approximately 15 mm Hg (millimeters of mercury), the range of normal eye pressure is much larger. About 90 percent of people will fall between a pressure of 10 and 21. Even so, this does not mean that if you have a pressure of 22 or higher it is abnormal.
What is normal peripheral vision degrees?
This type of vision is the result of different nerve cells and rods located outside of the macula. As compared to animals, humans have a limited peripheral view. A normal visual field for a person covers 170 degrees around, while peripheral vision covers 100 degrees of this field.
What is the difference between 10 2 and 24 2 visual field test?
In conclusion, this study showed that 10-2 tests improved the ability to detect central visual field progression compared to the central test locations of the 24-2 tests when using global trend-based analysis of MD, although it only achieved a 7-9% reduction in the time required to detect progression (or a total ...
Which visual field test is best for glaucoma?
Static testing in general is superior to kinetic perimetry in detecting slopes and scotomata (field defects), and tends to be more reliable and consistent, particularly for detecting glaucomatous visual field loss.
How do you read an eye field test?
0:366:44RS Visual Fields Part 2 Interpreting The Test Results - YouTubeYouTubeStart of suggested clipEnd of suggested clipYour gaze will naturally go to the grayscale plot which shows the areas of worst sight in deepest.MoreYour gaze will naturally go to the grayscale plot which shows the areas of worst sight in deepest.
What happens if you fail visual field test?
For example, it can range from a nearly complete loss of peripheral vision to a small area of partial loss. People with visual field loss may have trouble seeing objects out of the corner(s) of their eyes, lose their place while reading, startle when people or objects move toward them, or bump into people and objects.
What is the average field of vision while driving?
Just over half the sample (57%) had binocular visual acuity of 20/20 of better, and more than 90% of the drivers had a visual acuity of 20/40 or better. The remaining 9% had visual acuity in the 20/50 to 20/200 range, though most were between 20/50 and 20/100.
What is a visual field of 20 degrees or less?
In the United States, any person with vision that cannot be corrected to better than 20/200 in the best eye, or who has 20 degrees or less of visual field remaining, is considered legally blind. Visual impairments take many forms and exist in varying degrees.
What is the final result of a GVF?
The final result of a GVF is a diagram similar to a topographic map. An analogy commonly used to conceptualize these diagrams is the "island of vision.". In this analogy, the visual field is an island with a central peak and the altitude correlates with the visual sensitivity in a given location.
What is the visual field?
The visual field corresponds to the topographic arrangement of photoreceptors in the eye. When photons of light are absorbed by the photoreceptor cells of the retina, a cis-trans isomerization of 11-cis chromophore begins the phototransduction cascade, resulting in hyperpolarization of bipolar and horizontal cells, and ultimately activation of ganglion cells, which form the nerve fiber layer [4]. The nerve fibers travel to the optic nerve head, where the optic nerve originates. At the optic nerve head (also known as the optic disc), there are no photoreceptors, only nerve fibers. This region corresponds to the physiologic scotoma.
How are visual fields evaluated?
Visual fields are frequently evaluated by simply covering one eye and asking the patient to look straight ahead while using peripheral vision to identify an object, or the number of fingers shown by the examiner. The field is often tested at only four locations, which is sensitive only for large field defects.
What are the conditions for a successful visual field map?
Several basic conditions must be met for a successful map of the visual field to be produced by any method. The individual must be able to maintain a constant gaze toward a fixed location for several minutes. Each eye is tested separately while the opposite eye is covered with a patch.
