what is a 24-2 visual field test?
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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.
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Description. The BRIEF-2 is a set of questionnaires for parents, teachers, and now older students (ages 11-18), designed to evaluate executive function from multiple perspectives.
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The increasingly larger letter sizes on the lines on the Snellen chart above the 20/20 line correspond to worse visual acuity measurements (20/40, 20/60, etc.); the lines with smaller letters below the 20/20 line on the chart correspond to visual acuity measurements that are even better than 20/20 vision (e.g., 20/15, ...
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The test you will use at roadside is "Horizontal Gaze Nystagmus" -- an involuntary jerking of the eyes occurring as the eyes gaze to the side. When a person is impaired by alcohol or certain drugs, some jerking will be seen if the eyes are moved far enough to the side.
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The glaucoma hemifield test (GHT) is a sensitive indicator of differences between the superior and inferior hemifields. The VFI is an overall marker of field loss similar to the MD.
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20/20 vision is a term used to express normal visual acuity (the clarity or sharpness of vision) measured at a distance of 20 feet. If you have 20/20 vision, you can see clearly at 20 feet what should normally be seen at that distance.
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The requirements are as follows: You must be at a level of 6/12 or better in either eye, or 6/6 with both eyes together, when testing long distance vision; You must be at a level of 6/9 with both eyes together, when testing near vision; The police do not accept the use of colour correcting lenses.
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Part of a glaucoma examination is formal visual field testing, where your peripheral, or side vision, is tested. Ideally, your eyes are not dilated during this test. Finally, there are other parts of the front of the eye, the iris for example, which should be examined when your eyes are not dilated.
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The study defines "visual impairment" as visual acuity of 20/50 or worse in the better-seeing eye. Visual acuity refers to the sharpness of vision at 20 feet from an object. A person with 20/50 vision can clearly see something 20 feet away that a person with normal vision can see clearly from a distance of 50 feet.
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When the vision in the better eye with best possible glasses correction is: 20/30 to 20/60, this is considered mild vision loss, or near-normal vision. 20/70 to 20/160, this is considered moderate visual impairment, or moderate low vision. 20/200 or worse, this is considered severe visual impairment, or severe low ...
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Uncorrected visual acuity must be 6/36 or better, binocularly. Corrected low contrast distance visual acuity must be 6/12 or better for a 10% contrast target, binocularly.
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20/25 vision means that if a person with perfect vision stands at 25 feet away from a target, you will need to stand at 20 feet away from the target to see what this person is seeing. It is slightly worse than 20/20 vision but it is usually a clinically insignificant difference.
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The bottom number indicates the distance at which a person with normal eyesight can read the same line. For example, if you have 20/30 vision, it means your vision is worse than average. When you are standing 20 feet from the chart, you can read letters that most people see when they are 30 feet away.
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['Meet specific eyesight requirements: 20/40 best eye; 20/70 worst eye; correctable to 20/25 with no color blindness.', 'Meet the minimum Armed Services Vocational Aptitude Battery (ASVAB) score: GS+MC+EI=170 or VE+MK+MC+CS=220 or VE+AR=110 MC=50.', 'Be 28 years of age or younger.']
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Visual acuity is typically measured while fixating, i.e. as a measure of central (or foveal) vision, for the reason that it is highest there.
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Legally Blind Criteria Visual acuity of 20/200 or worse in the eye you can see out of best (with the best correction)
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The American Optometric Association states that a person with 20/20 vision can clearly identify a row of 9mm letters from 20 feet. So if you have 20/40 vision, this means that you can see only as good as a normal person can see at 40 feet away from an eye chart.