what does 24 2 mean in visual field 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
The grid that s used in the standard 24 2 test isn t designed to pick up localized defects in the center of the visual field he explains The usual way to compensate for that is by giving the 10 2 test it has good coverage of the center of The 24 2 exam is derived from the 30 2 protocol and evaluates the central 24 degrees of the retina with fixation centered on the fovea It has become a standard tool for detecting defects that could indicate glaucoma or other neuro ophthalmic conditions
what does 24 2 mean in visual field
what does 24 2 mean in visual field
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Although a standard test program and pattern e g 24 2 Threshold is often selected for the majority of patients be sure to confirm that the correct test was selected Reliability indices Examining the reliability indices is the Up being to test the central 24 24 2 setting Some examiners test smaller or wider visual angles however the wider the visual angle tested the more coarse the grid and hence the greater the likelihood of missing small scotomas The 24 2 assesses the central 24 with a 54 point grid 10 2 assesses the
It defines mild disease as having no visual field deficits on a 24 2 Humphrey visual field whereas any scotoma that s not within 10 degrees of the central fixation and is only on one hemifield is moderate glaucoma and any scotomas that are either in both superior and inferior hemifields or within 10 degrees of fixation are considered severe The location and the pattern of the points tested on the retina are decided by the different programs available on the machine For example 30 2 24 2 10 2 and the macular program are available on Humphrey Field Analyzer HFA The 30 2 tests the central 30 degrees field of the retina with fovea as fixation
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When interpreting a standard Central 24 2 Threshold Test the baseline visual field test analyzing the central 24 degrees of vision the results are divided into 3 sections patient and test details displays of sensitivities across the visual field as graphical plots Identify the trial lens power and ensure that the most appropriate prescription was worn during the test The top parameters will also confirm what type of field test was performed most often it is the 24 2 SITA threshold but still confirm that the correct test was selected Figure 2 Top Patient data for the Central 24 2 Threshold Test
The 24 2 and 10 2 are 2 commonly used visual field patterns the 24 2 measures the central 24 of the visual field and contains 54 test points that are 6 apart whereas the 10 2 pattern measures the central 10 of the visual field with 68 points that are 2 apart Visual field VF testing although sometimes described as torturous by our patients can be gratifying and important to interpret as an ophthalmologist especially when done systematically This article provides quick pearls and a framework by which you can conquer interpretation of VFs and points you in the direction of relevant
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what does 24 2 mean in visual field - The visual field standard is the Humphrey 24 2 threshold test The four points at the upper and lower extremes of the field are ignored for the purposes of this staging system An abnormal point is defined as a point depressed at the 1 level or more on the corrected pattern standard de viation plot If any of the central four points is